Its all nice and dandy and I really appreciate that development of Thunderbird has awoken from its hiatus, but I really really wish they would fix the Maildir storage and make it standards compatible, so that one can use other mail tools like offlineimap (aka nbsync) or mu on the same Maildir store.

Please let form follow function...

Edit: some other user pointed out that Maildir support is on the roadmap: https://developer.thunderbird.net/planning/roadmap#maildir

Great news!!