And what have PRs got to do with mailing lists per se?
I posted in the programming community. Mailing lists are used for submitting patches.
a good email client will have some functionality that improves things a bit
I've tried Thunderbird, KMail, and whatever the Gnome one is called. Frankly, it doesn't really improve on legibility. It's a bit better, yes, but even hackernews looks better. It's a far cry from lemmy's UI. If they had markdown support, that would be an improvement.