I can't fully agree. Maybe from distribution/binary PoV might be more secure, but built-in browsers password store are accessible by your own apple/google/micro

I can't fully agree. Maybe from distribution/binary PoV might be more secure, but built-in browsers password store are accessible by your own apple/google/microsoft/firefox account. So if someone compromise your email, it will get instant access to all your passwords too. None of those use a separate encryption key to make sure someone that got access to your account don't get access to passwords.