I claim no computer expertise but in my narrow and limited taste in computer games Windows 7 = Windows 10 just fine.
I have to run the WOFF.exe in W7 Compatibility Mode as I have W10 Pro.
Of course, within a narrow scope that may be true. I'm talking about a much broader scale (more games, more/different hardware, drivers, etc...)
You have to realize that an implicit goal of Microsoft is to force everyone to a subscription model for software (specifically, the OS). They sure as h#ll didn't 'give away' all those W10 upgrades because of humanitarian goals, I can tell you that.
Already, a lot of people using all kinds of software that ran just fine before the "upgrade" are running into problems running the same stuff under W10. And every update (which are forced, ultimately) makes it worse.
Microsoft figured this out years ago (see Steve Ballmer's "Developers" rant: > here <
That was real, and a long time ago (c.2000): Microsoft knew then, as a business model, the way to force OS changes (and thus, drive revenue) is to control the programs that can run on an OS. (During the video, he's stressing that if you get the developers to write code for platform x - whatever x is - then people will have no choice but to use platform x). Developers, developers, developers... a well-known rant among computer geeks like myself. Not because it's amusing (it's honestly rather scary TBH)...but because we recognized then what it meant.
Nowadays, it should be no secret M$ wants everyone on W10, and thus (ultimately) a subscription service platform. One way to go about that is to progressively limit the programs (games, or whatever) that will run on W10. This is essentially what is going on with TW: It runs, but there are already reported problems. So, in order to make it fully compliant/stable, the developer must go back in and rework the code. If that developer doesn't want to or is unable...well, you're done. Happens all the time. Lots of people out there who refuse to update because it would mean losing their favorite games or programs. It's not new in W10, but it's definitely becoming more and more aggressive.
Also, don't forget: Even if it might run, the bottom line is if the developer doesn't officially support W10, then it may or may not work reliably, and users have no official recourse.
(And, again, I seriously doubt TK/TW would be so disingenuous as to promote a $25k crowdfunded campaign for something that essentially already exists, while representing SF2 Complete runs on W7, if it would run on W10)