It probably doesn't matter for you if you'll never be leaving Apple's ecosystem, but for anyone else, I think that's something to keep in mind before moving to a non-portable solution like Apple keychain.
Just thinking outloud to myself - if Apple could embed their key management tech in a simple cross platform UI and support Windows, Linux, iOS, Android, and the web like Bitwarden - they'd be a viable alternative.
Yes, non-portable across different OEMs. But Apple Passwords app lets you export your passwords in a nice little simple csv file. It was a suspicion-filled (because it's Apple) pleasant surprise to find that out.
In the old Apple passwords thing, they used to have that export feature but they took it away at some point. Learned this the hard way when I switched to Linux for a while.