I don't really care, but I can only imagine that your opinion of what is "beautiful" doesn't carry much weight with the folks that have to build and maintain this shit.
The shit is already built, they need a system admin to keep it running.
If those devs were smart enough they could do this transition transparently , you could continue login with your email/password but for some reason management wants this, this is someone project , instead of creating something new and good they move shit around.
It's a shame the people you say are working to maintain the infrastructure are so disconnected from the users that they are satisfied with it being, to quote, "shit."