Why are they repeating the 6 key themes twice but phrased in different ways and in different order? And then there are 6 recommendations and 5 improvements which are very similar to each other, but the article doesn't say how they are related.

I would suggest they first "demystify the language" and "streamline information architecture" of the article itself.

Also some details would be nice. And some acknowledgement of an understanding that the UI being "dated" and not "modern" probably isn't what's making it difficult to use.

If I were one of those 10 people I'd have told them that I love "dated" UIs. Most modern UIs are trash. I'd hate it if efforts to make Thunderbird shiny enough to attract users sacrificed functionality, ease of use, or customization.

The post is vibe-slop, prompted by non-technical PM who viewed the task as a chore.

The tone with which it manages to objectify the users and distance from them is a cherry on top.