Glad to hear, I'm pro this (at least as far as I understand it), I've always had the forethought not to "cross the streams", but lots of colleagues didnt and it leads to weird quirks every now and then, but no show stoppers, at least as far as we got.
I think we can all agree this needs to happen, I have had instances where I have been configuring Outlook with a work email and because the address was also an MSA it was auto discovering to MicrosoftAccount\email@example.com , took a while to figure out I had to change the username to org.com\firstname.lastname@example.org.
The idea is good as it causes no end of confusion to end users, even those that are quite senior and have extensive experience. However, it will depend on how the process is implemented. So for now and playing a game of wait and see