You love HTML emails, don't you?
As a developer, probably not... but subscribers absolutely do. They devour them, consume them on every device known to man, and drive a hell of a lot of revenue for companies that take their email marketing seriously.
But most web developers tasked with building HTML emails merely want to get them out the door as quickly as possible and move on to more interesting assignments. Despite email's perennial value for subscribers, tight timelines, and a general loathing of the work result in things falling by the wayside; and, just like in the web world, one of the first things to be set aside in email is accessibility.