story
For now. What happens when they eat enough of the market and displace enough other tools that the government says "Ok, now MitM the encryption." All they would need to do is push an update and re-encrypt the first time you unlock it. Now, this has always been true, but it's not on your servers and source repos yet, right now it's sandboxed.
How about internet outages? Service outages? Sure, local cache, but that cache expires.
I love PW managers, even cloud ones, but I wouldn't tie on directly to my local login and auth infrastructure to the exclusion of other local options.
I have autofill turned off because it can fill into nefarious forms if you're not careful. And I copy and paste from my pw manager into my terminal when required, because again I don't want it automatically being helpful when I want to be careful.