No unified inbox please!
Long time user of K9 email - still using 5.600 as the later versions appear to lack the ability to disable the annoying unified inbox and return to the older layout I prefer. I am sure I am a niche-case as most mobile users will only have one email address. Shock news for younger readers: I run my own email server at home (Rocky Linux/Sendmail/Dovecot) with several mailboxes on different domain names! This often leads to the question from dumb-people: "why don't you have a normal email address, like gmail/hotmail?". Answers on a post card...
I hope TB on mobile is more like the TB on the desktop with separate mailboxes. It is slightly tedious to keep side-loading the older K9 app each time my phone/tablet have a fit and decide to update everything - even when the auto-update is disabled for K9.