Sad there is zero response to your reasonable observation and request. I too am a 25 year lover of Thunderbird on my PC. It is hard to believe the Android version is so deficient. Apart from your noted slowness it has absolutely no add-ons, no html in signatures or anywhere else, and no way to sync it with Google Calendar. I am sure there are other deficiencies but these are the ones that directly affect me. I continue to hope that features emerge that are routinely provided by more obscure email apps.
