Do you think GOG will ever let us permanently delete games from our accounts that we know we don't want, like Steam allows us to do?

No, and i think that's smart, tbh. Saves them the trouble of drama (someone breaks into an account). If you ask them nicely, i hear they sometimes do in support requests. We have to accept even free games, so if it's in our account, it's totally our fault. Just don't let anyone see your library, and you won't have to worry about that copy of A Kiss for the Petals, Huniepop, or Hatoful Boyfriend coming back to haunt you.

EDIT: There's also the hide feature.

Why would you want to? There is no benefit to either you or gog to implement such a thing. If you don't want to see it, set it to hidden.

Some users have asked exactly the same question.
Contact GOG Support and they can remove games you do not want.

What would be the point? There is no point.

Generally speaking no, but we must also remember that demo versions are like real games in GOG library, and it's easy to understand why some people might want to get permanently rid of demos for games they don't like.

For people to delete Fallout 3 from their accounts after the massive disappointment of course.

Maybe GOG should just add another category in 'My Collection' called 'Demos' and all the demos and alpha versions
would automatically appear there and will also not be counted as an owned game in your library. Then you can just
hide the full games you don't like or something in the 'Hidden' section.

Well even on Steam you can restore games that have been deleted from your account (assuming it was removed by the account holder and not Valve), I've done it a few times, but on the other hand I don't except GOG to be as forward thinking as Valve here.

Sounds to me like it's not really deleted, then, but put in a special type of hidden folder that is called "deleted."

no. admin staff can delete, but records have been kept. therefore they can restore again. when the game is deleted, it is removed completely from the users library.

edit - basically, they just add it to the library again

Well, that's basically how this works. Kind of like how much of forum software allows "deleted threads" to come back: they're never deleted, just hidden and made unavailable to anyone who's not a moderator. The library is just a manifestation of the records, because they can't really simply follow a bunch of paper trails through their system. The difference being, with gog's "hidden" you can actually go in and view the hidden material. Anything else would be too inefficient to be effective, especially given steam's huge user base.

Do hidden games still show on your profile page? They used to.

I don't know, I set the profile page to "f off". Though I expect it's probably still leaking my data.

Kind of, but not exactly.

To simplify this a lot. What happens it when you buy something from a site like Steam (or GOG), say you buy "Game A"... it's marked in some backend database that user with id say "4321" bought "Game A" with id say "1234". When that info, like your library, is pulled and displayed to the user, say on the website, you query that info from a database using a unique key like the users id which everything you buy and do is linked too. What Steam is probably doing is creating a record in the database when you delete the game, which is then updated if or when you restore the game to your account.

The game is actually deleted from your account though. There is simply a record kept in the database that is tied to your account id in case you want to restore it later.

You can hide your library games on Steam just like you can hide them here. That function is not the exact same as deleting them. They still show up as owned in the system and still show under your game total in your profile, etc.

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And with forum software, sometimes forums will set up a hidden board that only moderators can access then move threads to that board instead of deleting them. So in a sense your are correct, but forum threads can be actually deleted if a mod wants to or has the power too, which usally can't be reovered. Some forums admins though feel it's better to keep threads rather then deleting them to watch lower mods who may be removing threads that shouldn't be removed, so they only give them the power to move the thread, etc.

It's more of a check and balance thing then an actual feature of forums...at-least that is my exeprience with the forum software I have used over the years, granted it's been a few years.

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@OP: I would also like to see this feature. It would not be that hard to do, and it's easy enough to create a record that can be used to restore the game should one change their mind.

I have games I would like to remove myself, some were free that I didn't care for much and some are demo's etc. I'm a bit OCD about keeping my game collection nice and clean with games I actually want to play.