<tl;dr>
no thanks
</tl;dr>
Long version:
I just got updated to Thunderbird 68.0 on my linux desktop systems.
Started it, and found that ALL add-ons except two had been disabled or removed, and the two that were left did not do anything anymore.
For example, lightning was still there but there was no way to actually open your calendar.
Good thing I had a way to roll back to 60.8. That one works the way I need it to.