A bit misguided.
All Apple wants you to realise and use is IMAP or iCloud, which takes up less space than POP email, but still gives you headers to ALL your messages, for threading and conversations.
This is similar to iTunes Match.
The best thing they can do, and that you should suggest, is to HIDE undownloaded messages, and then you will start whining where did your messages go.
Learn a bit, and progress a mile.
Again, ditch the POP baggage.
iOS 7 mail is way better than iOS 6.
Hated having to set messages to 1,000 in order to have decent enough pre-loaded message headers when searching.
Much like the download limit message setting on a desktop, there is a built in algorithm for downloading messages in iOS 7 mail via IMAP.