Congratulations and all the best with the new leadership of K-9 mail / Thunderbird for Android.
I am not sure how others use Thunderbird Android (formerly K-9 Mail), but I like to keep the emails as pending (unread reminders) until a resolution is taken or until it is done. An accidental finger-swipe can destroy the notifications and now I have to find them by manually launching K-9 mail with no easy way to restore the notifications. Another useful feature is to snooze them or "notify me later" or "reminders".
In my opinion, it would be great if we had "Show all unread as notifications" buttons in case they get accidentally dismissed.
Thank you.
Sincerely,
Rishikeshan L/S