I don’t know about the secure enclave, but I can anecdotally say that I’ve been using Bitwarden seamlessly across iOS/Windows/Linux for a while now. It uses the convenient auto fill api thing on iOS and the extension is pretty good on desktop as well. (Although I haven’t worked with it on Mac)

Haven’t had any issues, I switched from LastPass and the only feature I miss for personal use is password sharing. I think it was in the free version of LastPass but not part of Bitwarden. I didn’t really use that feature much anyway though.