Hardware companies need money. Yes, Doom need at least 16GB Ram for running the game in 1024x768 pxs, as said windowed and ILL for sure need more when the release it. It's programmed onsolence, while current PC can survive almost 15 years or more, they try it with the soft to make these obsolete. Apart of the prices for these games, DOOM>€100 and ILL for sure isn't cheaper. OK. the graphics are stunning, but this don't make a game better than others, these games anyway, apart of the graphics, offers normally an gameplay pretty lineal.

My favoritefirst person game since almost 10 years is The Dark Mod, nice graphics, not worse as in commercial games, intelligent gameplay, it don't need an NASA computer to run it, almost any cheap Laptop is enough, works on Windows, Linux and Mac and is 100%free. 170 community made missions, more released every few month, you can download and add these in the same game menu.