Feel free to wish for an entirely different standard, but I'm curious as to where this "expectation" about the "proper" contents of a GOG release comes from. The explicit goal of GOG as a service has always been to make the regular un-modded plain old version of the game in question running on modern operating systems - nothing more, nothing less. While a lot of user-created stuff do work with many of GOG's releases, our beloved Polish pranksters are not in the business of adding entirely unofficial and unsupported mod content to the products (and whether it significantly adds or detracts from the game experience is neither here nor there in this regard, especially from a legal standpoint).
It comes from this quote from GOG... "Thanks to our handsome programming team, the classics are now Windows Vista and Windows XP compatible. Now you can use your lightning-fast PC to unleash the full potential of those games you just couldn't play properly on that busted old 386."
DDFIx does just that. It makes the game work on lightning fast PCs. without that, you have a game that can't use modern screen resolutions. "modern as in... several years have passed since square monitor resolutions has any value to a PC game. I'm not saying its GoG's responsibility to add functionality... but you and I certainly don't agree on whether they should ignore current tech that already exists to make it happen.
The legal comment is a bit much. The results from DDFix could be accomplished with the in house programmers of GoG.
Thief fans have been rigging their game for over a decade. Its sad that an advertised "Modern" installer is out and it doesn't take into account all the breakthroughs folks have made to make this thing work.
I see your point, and I referenced it in my original comment. I think you are assuming I'm asking for opinionated things like texture updates and reworked architecture... NO, I expect movies to play and my "lightning fast" PC to be able to show in an acceptable resolution. Nothing more.
So please tell me... how would adding content that makes the game playable purely from a support perspective to the extra downloads be a bad thing? How is that wishing for an entirely different standard?