I agree about the sorry state of non-Google notifications on Android. I wish someone would make a common notification framework for the Free world that would be installed alongside system-level F-Droid. Although F-Droid Conversations and Element notifications do work fine for me, regardless of purportedly less battery life, I can understand not everyone wants to make the same choice.

However, I'm referencing more than the notifications issue. I recall an early thread from Signal where they touted the benefits of fully opting into the Google ecosystem - the gist was that Google has expended all of this effort on security and they wanted to take advantage of it to bring security to the masses. And that simply doesn't line up with my own threat model, in which Google is one of the most significant attackers.