Microsoft already nailed this
As someone who actively enabled passwordless auth on their Microsoft account - I'm an advocate for this.
Not only do I have to not worry about a password (even though I use 1password for everything else), it actively has 2FA built in: I log in > I get an auth prompt on my phone > I approve it > I have to select the correct number shown to me on my computer from the list > If I choose correctly it logs me in.
It's pretty simple and stops bots from trying to crack my password. If everyone else takes a leaf from the MS book, I'm here for it - one overarching auth platform.
But this is just one positive opinion against, I'm sure, plenty of people who would rather comment negatively than try :)