Very similar experience to my own. Was a 1P customer for years, but the product declined after the VC purchase and I trust Apple more to get privacy & security right. Apple Passwords accomplishes the minimum of what I want a Password system to do. Yes, 1Password has some nice add-ons like SSH agent integration, secure notes, etc., but some of these aren't necessary or have workarounds as outlined in this post.
I really do wish there was some way to integrate Apple Passwords with Linux, but I don't see that happening. FWIW, iCloud on Windows isn't horrible and has decent Apple Password support as it even works with iCloud Advanced Data Protection now.