I’m OK with the GOG versions missing features, be it multiplayer, Linux support or anything else.
I’m not OK when I have to pay the same price for the version with missing features than a Steam user has to pay for a more complete (but DRM'ed) version.

There is an easy solution for that, not buying the game on the price you don't agree with.

I buy a game when the price GOG is asking sounds agreeable to me, even if the game happened to be cheaper to someone else (in another store, or due to regional pricing). If I can buy a game I want for, say, 5 euros, I don't really care if Russians can buy the same game for 3 euros and Chinese can buy it for 2 dingdongs, and Steam is selling it at 4.50 euros. In general I oppose the idea of regional pricing especially for digital goods, but in itself it is not a deal-breaker for me.

Also, don't forget that GOG versions of games also have features that Steam versions don't: offline installers and being officially DRM-free. So in that sense Steam games should be sold cheaper because they are missing those features, right?

Achievements and/or soundtracks are not useless at all. On the contrary, they are a great selling point, and many players will buy games in part because of them, and conversely, also not buy games that don't have them on GOG when they do on Steam.

Many of GOG's potential customers will indeed not buy their games here that treat them like second-class citizens, which is very bad for GOG (especially given the many hits to their reputation that they've already taken in recent months and years).

They need all the income they can get, and allowing their customers to be treated unequally to their apparently "higher class" counterparts on Steam is a hindrance to that.

As for your claim that all GOG has to do is list Achievements on the store page and that's enough: no it isn't, because the store pages on GOG never explicitly make clear that the GOG version is missing that feature even though the Steam version does have it. No user can ever make that determination solely from looking at the GOG store page for the games, because GOG isn't upfront (like they should be) about the fact that the games have Achievements elsewhere.

So therefore, a lot of customers won't even know they are missing features until after they've been deceived by GOG having committed the sin of omission (meaning, not explicitly & directly disclosing the fact that the GOG version is missing features that other versions of the same game do have).

Moreover, as it relates to these Batman games in particular, there is another level of diabolical misleadingness to these shenanigans, because some of them do have Achievements, but one doesn't.

Therefore, a lot of customers are likely to look at the store pages for one or two of them, and see that Achievements are listed there, and then from that, they will infer --- perfectly reasonably --- that all of the games in this series on GOG do have Achievements, and go ahead and buy them all, without taking a magnifying glass to every single store page for each of the games....

...only to find out later, that they've been bamboozled by that sin of double omission (both omitting the Achievements, and also the failure to disclose their absence in an upfront, direct, explicit way), and they didn't receive everything that they reasonably thought that they would be buying in exchange for their money.

No, actually, that [does not make sense at all. I do not want to "stick with Steam." I am not even "with them" in the first place. I almost never buy games from Steam, because I hate their DRM client, and a lot of other things about them too.

What I want is both:

a) DRM-free games on GOG, and also and equally so:

b) not to be treated like a second-class citizen by having the games on GOG be stripped of features for no good reason, but rather solely because the publishers/devs are being lazy and/or cheaping-out because they don't care about GOG customers as human beings (yet they still want money from us anyway, and charge the same prices as on Steam for the gimped-down, feature-removed GOG versions)

Although there will indeed be some people who "stick with Steam" over this matter...which if they do, that's also very bad for GOG too. GOG needs a lot of them to become faithful GOG customers. But that ain't going to happen if GOG keeps allowing featured-removed games to be hosted on its store.

They are to me, in a sense that missing them would be any kind of deal-breaker to me. I am interested in the actual game content, not fluff.

If someone else considers them more important, fine, I guess he shouldn't buy games that are missing them, and buy them elsewhere where they are included.

Steam games never explicitly make it clear if they are missing features available on some other stores or (console) platforms for the same game. They only list what are the features that the Steam version includes, period.

You can't really expect that GOG.com (alone) goes through their whole store library and makes some extensive parity check against some other store(s) versions of all the games. They should just clearly list what their version of the game offers, and that's it.

If someone wants to make some comprehensive cross-check against all the other existing stores, platforms and versions of the game that have ever existed since the dawn of the humankind, and beyond... I guess that is up to the concerned customers themselves.

It is totally unrealistic to expect GOG would continuously make such cross-checks to their whole store library, against Steam or all other existing stores. No other store or service does that either.

As long as GOG doesn't claim that that one particular game has achievements (when it doesn't), then from my point of view GOG has done their part.

Got myself Arkham Asylum and Arkham City from this sale. Haven't played them since a while so this sale was very welcome.

That game is available for free.

https://www.fileplanet.com/archive/p-80272/Area-51

https://www.patches-scrolls.de/patch/392/7/
https://www.fileplanet.com/archive/p-27985/Area-51-Patch-v1-1-Germann
https://www.fileplanet.com/archive/p-79938/Area-51-Patch-v1-1-European

https://community.pcgamingwiki.com/files/file/1483-area-51-hor-fov-fix

Hmmm...

:)

Thanks for the link! Although I'm not an FPS person myself, others will appreciate it.