I've noticed a small issue with my email client for quite some time now where composing a new email will have several blank lines by default.
It's not too much of an issue to simply delete them but hey, maybe no one had pointed this out before! So I filed a bug report only to get this response… basically it's not a bug, its a feature!
Seems to readily impact 50% of the entire function of an email app (to write emails).
Seems like a weird hill for Proton to not want to climb down, considering their position within the email client marketplace. I would absolutely make UX a high priority.