The point is to transition to a subscription based OS. You subscribe, pay a monthly fee for services like Teams, Outlook, etc.
The LTSC editions probably won't ship with that bullshit, so it's probably safe to say that they can still be usable even after completely transitioning to a subscription based OS.
Nah, ReactOS is a waste of time and effort. It's like constantly trying to guess what the other person is holding in his hand by doing questionares with the guy... you're bound to lose if he's always 10 steps ahead of you.
On the other hand, Wine, thanks to Proton, is doing quite well.