I use bitwarden over Firefox because it can auto fill into apps. So, my bank apps or whatever else. And I’m not tied to Firefox if, for some reason, I want to stop using it.
It’s similar to why I don’t use Samsung pass on my phone. It’d work better filling in the fields, but that’s not going to help me on my PC, and I don’t want to maintain multiple managers.
At this point, probably not. But, at one time, I did leave Firefox for Chrome when it was new.