Changing linked gmail account with Android Phones

Was searching for a mechanism to remove the linked gmail account with my office android phone. As per the link below – only solution looks to be to reset the complete mobile by clicking on Factory Data Reset! :(…. Not sure why this restriction has been placed. Why can’t I change my gmail id?

http://androidcommunity.com/forums/f29/is-it-possible-to-change-your-linked-gmail-account-or-do-you-have-to-do-a-phone-reset-5718/