ToonamiFan: Win 10 just has too many problems with older PC games.
Yes....among all of the other serious issues, this is exactly the conclusion I formed after seeing innumerable Steam down-thumbs for older games in which tech problems are blamed...and sure enough, the user is running Win 10.
But I started to question that after a few people claimed they had no problem with older games. Now it's much easier for me to believe that these people only tested a microscopic fraction of all the games from ~1998+, and/or are perhaps being....overly defensive of Win 10.
ToonamiFan: On the other hand, Win 7 is butter smooth with every game that was released post 1999 and almost all of those games before 1999 are available on GoG, adapted for Win 7.
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I also run Win 7 for older games. It's at least post-1997, though, as I run Unreal and Half-Life, which were released in 1998 (Valve since changed HL to OpenGL, but nevertheless it ran fine on Win 7 prior to that).