Apart from the UI which is crap since their last major update. There are menu options everywhere, two ribbons on the top, a hamburger menu on the right and another on the left. For a long time you opened Thunderbird and it didn't default on the last message that you received but somewhere in the middle of the heap.

> Apart from the UI which is crap since their last major update

But when they updated the UI, they

- Added options to use to make it very close to the old layout

- Set those options for you if you had it customized like that in the previous version

Which is IMHO much better than how Mozilla handled the redesign - you can get the old style in a GitHub repo thanklessly maintained by one person, enable userchrome support in about:config (until they decide to take it away one day!), and enable compact mode (also gated behind about:config and called "Compact (not supported)". Oh, and remember to update the userchrome every few updates because they keep breaking it.

That's the difference between user-centric and not user-centric.

It's hard to be in charge of a project like this. You're criticized no matter what you do.

The old UI was criticized by some for being outdated, a mix of old and new styles, didn't fit well with new OS/app styles, etc. It was crap. So they update the UI and it's still crap... for other users. Damned if you do and damned if you don't.

As a longterm thunderbird user I find this annoying. I appreciate it being maintained more actively again but I really liked the fact that the UI stayed stable for years. Changing things to make them "more modern" is just annoying. No one asked for this.