If it wasn’t good UX why would other companies want to replicate it?
That question actually answers itself. Because managers of companies use the exact logic you’re using. “If big company X is doing this thing, they must have a good reason, so we do the same thing.”
MS constantly fails at basic UX. It’s not the company anyone should follow when doing UX. But there’s a lot of people that don’t know what they’re doing and just copy someone else hoping they know what they’re doing.