The flanking rule works as is. If you disagree with it, it is your prerogative as a DM not to use it. Declaring, that since you disagree with it, there is no need for it, is short sited, and a bit of a douche move.
So I'm a douche? Wow,you Awesome Adam. Now I'm a douche.
This is not appropriate behaviour on EN World. Cut it out, please, both of you, or take it somewhere else.