1. Is not necessarily true. If you use an open source browser like firefox, your browser vendor would absolutely not be able to access your passwords (...without creating a huge scandal where users would catch up immediately)
3. Can actually be mitigated, or other options can be used. For example, in my browser I disabled JavaScript clipboard access, so that random websites can't access my passwords. You mention pass, aan excellent non cloud option, which I personally use with a script that types in the password as if it was a keyboard - but Firefox and chrome plugins with autofill are available, and those are offline.
3. Can actually be mitigated, or other options can be used. For example, in my browser I disabled JavaScript clipboard access, so that random websites can't access my passwords. You mention pass, aan excellent non cloud option, which I personally use with a script that types in the password as if it was a keyboard - but Firefox and chrome plugins with autofill are available, and those are offline.