One more thing: if the idea was that any user could flag GOG games at out-of-date (as a warning label to other users), then I am against it because we have idiot trolls like apehater and some others in this forum who would go on to flag all GOG games as "out-of-date", just to spite GOG and other users.

But if it was a similar feature like "mark a message as spam", ie. alerting the GOG staff about it, then I see the benefits.

In some cases, like Daedalic adventure games, the German version is actually the original version.

This would be a great idea, but it is very complicated to have every game up to date.

As some say this GOGmix is basically the same and updated.

You would be surprised how many Germans are doing the same. I am different in that regard because if a game offers a language version of my nytive language I just want to have it as an addition. Often because i grew up with it and sometimes just because ;) However a missing language version is not actually an outdated version. We are really talking about missing UPDATES meaning bug fixes or additional features - things that available on Steam leading to customers buying there instead of here or even getting angry because they bought here realizing too late that the game is outdated.
No, it is not. The devs should simply do the same they already do on Steam - problem solved.
Don't like Rammstein at all ... also not typical German songs but this is going OT ;)
Several English players complained about the English voice of the Protagonist in Whispered World while there weren't such complaint with the German version. Just saying that there sometimes could be a reason to stray from your principle. I also wouldn't advice you to play games like "Hyperneptunia" in English. :)