I also agree on "for personal things we don't need SaaS" and I would say do we even needs self hosted in the sense of a central server.

By that I mean, could we have like for firefox , heavy clients but with client to client sync. The goal is to not need to have a always online machine while still solving the "i prefer if my emails are copied both on my laptop and my phones" . Especially as nearly all my devices are often if not always on the same LAN