One thing I've noticed about FairEmail is that it is able to do low power push messages via IMAP IDLE, without any kind of external cloud push platform, and mai

One thing I've noticed about FairEmail is that it is able to do low power push messages via IMAP IDLE, without any kind of external cloud push platform, and maintain this reliably across connectivity state changes. Indeed, with a good mail server, it often seems more reliable than Gmail and their own push implementation. I don't know enough about the design patterns expected of an android app, but I think there's something to be said for getting robust functionality on as many versions of android as possible (including older devices), and in then keeping that sync engine stable once it works. Given the amount of per device bugs you encounter, moving to newer APIs is likely to result in a whole host of new regression issues that users won't like.