I think it is falling on 'deaf ears', unfortunately. It seems that nobody is prepared to offer a combination email/calendar application for mobile. Not Mozilla, Vivaldi, Opera or Edison Mail, etcetera. Why is it so hard?
All valid and worthwhile comments. Sadly, I don't think Mozilla are remotely interested in building Thunderbird for mobile devices. In the meantime, I for one, have shifted to Vivaldi and it is brilliant.