GOG announced that they want to be less transparent and more open to their customers. We'll, that's us - or at least myself, who keeps buying despite all the boycotts. I'm up to 710 games now and have been here since 2015 I'd say. Regardless, if GOG actually listened to us, we would have:

First and foremost, content filters for the kinds of games that people don't want to see.

Secondly, an attempt to get the prequels and/or sequels to games that are already here.

Thirdly, a more open view of submissions. You know that overwhelmingly positive new game that launched on Steam yesterday (hypothetically)? Well, it may have been submitted, but GOG rejected it for reasons unknown. Maybe their staff is not aware that people were going to spend a lot of money on it. That's the most important thing after all to any business, seeing as GOG is not a charity service.

Finally, wouldn't it be great if GOG staff actually gave us a response on the wishlist? It would be better to know why we couldn't get a certain game at this time, or that they've asked the developer if they want to submit their game and it was refused, than nothing at all. I know one site in particular that has a Discord server for requests and if they are in the process of bringing it over, they will let you know. Or illustrate reasons on why a certain game can't be released right now. It's again, better than hearing nothing at all.

So what I think that we all would like, is a GOG that listened to it's customers, who I think have the best in mind for the company. After all, we buy the stuff and make them money. We should have more transparency and perhaps even more of a voice in some of the decisions that are made here. If GOG was made for gamers, then maybe it's time we were heard a bit better.

Whilst I agree that it would be good if GOG actually listen to issues and suggestions - I have a long list myself for instance changelogs, compression, ability to download old versions, I really don’t see you getting the information you ask for. They may add filters, it seems that is all the new focus is doing, adding some rearranging “features”. But actually giving information on why things are rejected isn’t going to happen, for a number of reasons, legal requirements not to discuss things for instance, also it would open a can of worms amongst users. Once contracts are signed then there probably isn’t that long to appearing on he site so you wouldn’t gain anything.
As for the sequels and what not, I doubt it is them denying them, it’s up to the dev to want them here. If the dev simply doesn’t want to bother then that’s that.

None of the things listed in the OP should be important priorities for GOG, much less should any of them be "first and foremost."

GOG has much bigger problems than those listed in the OP which must be dealt with first, such as: DRM creep, lack of crossplay on most games, lack of feature parity (especially Achievements) on many/most games, very few AAA games, not enough quality new games being released on a regular basis, banning of Devotion for political reasons, the lying about the reason for banning Devotion, never addressing either of those Devotion issues, the financial losses that are accumulating towards bankruptcy due to such unresolved issues I've just mentioned, etc. etc.

I beg to differ. Seven thousand users asked for adult content filters on the feature wishlist. If you are going to have adult content on a site with all-ages titles, then please filter the adult titles out of it. Even Steam does this, there is no excuse. I champion these titles but stand with users who want proper filters.

I'd guess the OP's list appeals MUCH more to the average consumer than yours would. These forums are not representative (at all).

A lot of sites i've seen SFW / NSFW flags to toggle content marked adult. It's curious they didn't do that right away; Adding a single new field in their database for 'bool Adult' would be easy (Probably taking less than 2 minutes to apply the new field), and applying a filter is literally an SQL text append to include 'AND adult=false' and add a button to add '&adult=false' to the html.

The fact such simple yet useful features aren't implemented is due to laziness, or is the ineptness of who they hire and probably only have 1 programmer who implements sales updates.

Yeah, that's what I thought. I figured it wasn't too difficult to program in those filters. So this must just be some odd action on GOG's part, which is peculiar to say the least.