Indeed - what a lot of comments on this topic seem to overlook is that a lot of device specific bug fixes have been put into effect for push sync in FairEmail,

Indeed - what a lot of comments on this topic seem to overlook is that a lot of device specific bug fixes have been put into effect for push sync in FairEmail, without battery drain, and while only using IMAP IDLE (therefore avoiding cloud sync or sending email passwords to third party services for push messages). The idea of rewriting that every few years in a new language, or using new APIs, is counter to the principle of writing robust, reliable software without regressions. In my experience, those writing software that reinvents the wheel every 5 years end up ignoring and externalising the impact of regressions on their users, for the sake of using a new language or framework every few weeks...