Maybe for some games, but most publishers will want to maximize compatibility for their stuff (even with unsupported OS systems, if possible) to maximize sales. Compatibility wise, there isn't much difference between a fully patched 10 system and a current 11 system. Windows 10 still has 40% of OS market share on Steam, according to the latest Valve survey, despite being months away from getting the axe.
To put things in perspective, Valve supported running Steam on Windows XP all the way up through 2019 - a full 5 years after Microsoft support ended. They still support Windows 7, which Microsoft stopped supporting in 2020.
Bottom line - you'll probably be okay for a while. But you should also be careful running an unsupported / unpatched operating system.
EDIT: the only "gaming" features in 11 that weren't in 10 are DirectStorage and AutoHDR. DirectStorage would be the only thing that would prevent a game from running on 10, however DirectStorage has been backported to 10 so as long as you're up-to-date on patches you're good to go for the apocalypse.