I note that a lot of folks focus on the inbox. As I pointed out, I use a SMTP server of my internet provider so when I send emails from my ipad, they go out on that SMTP server. No copy is held there of course. I expect my IPAD to show me the SEND messages. Would moving to IMAP change this? I dont think so, although I am very sure that you are correct that Apple regard POP as has-been technology. (Never mind that half the world works with it. WHY? because it works !)
I do not expect Apple to decide what I can keep on my ipad, I will do that.
I do not expect them to decide which email protocol I use, I will do that.
I do not expect Apple to decide which emails I will keep and which will be deleted. I will do that.
Its MY ipad. As you will probably notice I am more than a bit ticked off with Apple's arrogance when it comes to the decisions and assumptions they make as to how I use my ipad. Although in this instance I think its just incompetence that has caused this error. Not enough testing. Lets hope they belatedly fix it.
Poor workmanship.