Use Mimestream. It's wonderful and GMail-backend-only fully native Mac App by one of the former lead engineers of the Apple Mail app.
$50/year? GTFO
What would that get you over just the chrome version?
IMAP, for one.
It would be much snappier, and would trivially support common native features like being able to open messages in new windows.
It's much worse. It is difficult to customize a native app, but browser apps are easy to modify with extensions, even easier with coding agents. If I have to use a proprietary app, a web app is least objectionable.