It's HN, so I'm not surprised by the old "just send text" argument that always gets wheeled out when this topic come up, but for those not in a terminal all day there are valid reasons to format HTML emails (that don't include marketing). We send out HTML emails and reports to our users that make use of progress bars, lists, photos, colours etc and they love them. They can get quick full updates on their business wit…
So I've adapted to the reality that "email client" is now a web page on a service somewhere, and "email message" is another web page. I don't have to like it, I don't have to use it, but raging against it is a waste of everyone's time.