It has negative security. Log me in for a fucking month, stop wasting a minute of my time every day!
And it doesn't escape my notice that all the fucking things I have to log into over and over and over are using Microsoft auth. Which granted, I think every office worker would notice that just from the ubiquity of their software, but still. And, on top of it, Microsoft's login flows are remarkably, consistently clunky. The forms jump all over the place and it has to refresh the page like 5 times as it's processing your credentials, and lord help you if Outlook needed you to sign in and silently opened that stupid auth window, because if you go through the entire thing, odds are great that you'll get a "security token expired, please do it again" message at the end. Like I dunno personally I wouldn't get a security token until the user has actually interacted in some way with the stupid form but what do I know I've only been making software for like 13 fucking years.
Oh yeah, bonus points: I use the passkey thing for my MS Auth app on my phone, and every single goddamned time I sign in, it asks me if I want to.... wait for it... create a passkey.
Edit: Oh oh and, for the above? If you're working through your morning coffee and accidentally click OK instead of cancel, it'll sit there spinning forever, not sign in correctly, and then you get to do ALL THIS BULLSHIT AGAIN.
Just, truly the biggest circus with the most clowns over there.