In my experience, this “not supported“ is not a big deal on Windows, really. At least i never had trouble running stuff for designed for either way older Windows versions, and also not running stuff for newer Windows versions. At least regarding normal applications, including music software. Gaming might be another story, but i don't game on PC anyway.
I'm of course not against Win 10 in general anyway, was just curious if people thought that previous versions were much better performing for audio