How could personality and identity remain the same? 'Cause I might not mind a stronger feeling of gender but I can't imagine that not being part of personality and identity.
They (well, okay, the personality at least) couldn't and they wouldn't. They will not, too.
Same goes there:
Of course not. The brain is the seat of your very identity and no one wants that being messed with, even if it might appear to some to be at fault.
It's the same reason I think I'd decline a 'cure' for Asperger's - I might be a better person after the procedure, but I almost certainly wouldn't be the same person.
Like it or not, you will not be the same person in 5 years time from now anyway, inevitably. You'll be a somewhat slightly different you. Also in a decade, two, three, etc. It's normal. In fact, what's worrisome is when one's personality doesn't change with time.
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The core point is: as brain structure changes with age (though we don't know exactly how in every detail), so does the personality. The technology Mech talks about - as I understand him - has a lot to do with that.