Hi Da•veed, yes, of course anyone with a level of competence could select the settings and deliberately turn back on the Mail account, however, that would exclude my young kids and certainly my gran, both of whom use my iPad and would may be be tempted to look at my mail out of innocent curiosity, so would help to take a little of the temptation away. As I said, not perfect...
Regarding your comment 'Don't let your cleverness by far confuse you' that's an interesting turn of phrase - I'll simply let any other viewers judge you on that one . . .
We may be getting hung up on the semantics of the interpretation of the phrases, 'multi-user', 'shared device' etc, however, many people would regard the iPad as something which can be enjoyed by more than one person - 'multi' being interpreted as 'more than one', 'user' being interpreted as person who 'uses', and simply would like to have a way of keeping the Mail application private, myself included.
I think many people appreciate the iPad is not a 'multi-account' device, but in some ways that would be interesting too, regardless of what Apples' plan for the device may be. It is very natural for people in any walk of life to take an existing object or service and to think about ways to evolve them for some specific needs or desires they may have, rather than stick to what the manufacturer or provider may have originally envisaged. Some may not be technically or commercially possible or desirable, but some may be. Many innovations in life have come about by people who 'Think different' . . .
Anyway, enjoying the banter.
Best wishes,