The HL3 memes don't even seem fair to use anymore. I don't even want to un-seriously make joke fun of them at this point. They are just genuinely doing so much for the community.
But overall Valve just seems straightforwardly less shitty towards the consumer than other major companies in their space, by a long shot.
GOG is an online shop. It shouldn't support anything but browsers, bank cards and download managers.
This would be a perfectly reasonable ask despite GOG being a webshop that only supports browsers.
GOG ships what's available. If game devs never made any linux binaries, then there won't be any linux binaries. What? You expected GOG to make a linux port of the game?
Games with wine don't require any special installers. Just open the wine desktop and install the windows game from there, like any other windows program you use in Linux. If you think that's too hard, then get a PS/Xbox and see my original reply, the one with the "we're doomed".
BTW, you can set up your linux to directly execute Windows binaries using binfmt_misc, but that may also be too hard for some...