I read this solution casually while looking for an answer, and I just tried it on a whim. It’s the one that worked for me. All you have to do is make a local account and sign in to that one. Wait a bit, and it will probably sort out your apps. If the tiles look dim, click them anyway and they’ll refresh themselves. If an app still doesn’t work, convert your other login to a local account and make the new one your Microsoft account, at least temporarily.
Though, I think my complaints with Windows 10’s slowness has a lot to do with user profile corruption. This new account feels much smoother. My advice would be, when installing, choose a local account, and then convert it to a Microsoft account later. It seems like it leaves more mess behind if you do a Microsoft account right out of the gate.