teceem: It's a bit confusing from which point of view you're talking. (Most) people here aren't publishers or stores.
Sure, for the masses, ease of use is very important. Nowadays there are still console gamers around that use 'configuration issues' as a reason to not play PC games.
Me, of course I like that GOG made a lot of old games playable with little effort - but I can get anything working without them too. Backwards compatibility, emulators and a lot of information online is a great reason to play games on PC/Windows.
My view is from a gamer, not publisher or anyone else. Although i do programming as well.
Certainly with emulators and good tools you can get most of the games/programs working that are decades old. If i want to play
Castle of the Winds again, well i can do that; But that would be impossible without Dosbox or VirtualBox and lacking a Windows 3.1 installation.
Ease of use could be either just getting it up and working (
configurations and emulators).
But i suppose some of that also comes from the games themselves. Played Albion recently? The mouse and UI interface felt backwards and not very intuitive, although i'd probably get a similar result if i try to play
Dark Sun again, or other old games where the design made sense for the time and emulated other games before the evolution of the designs.