26" vs 700c

Im surprised its to do with the geo, I mean it seems like most of the hardcore fixed street riders are just pulling bmx tricks which is what the mtb frames are designed for. I would have guessed that the main issue is that street mtbs are designed to have slammed saddles/seatposts. Riding fixed whilst constantly standing up isnt going to be that fun and as proved with that Brooklyn, having a massive seatpost just looks terrible.

I would have thought the original idea of tricks on a fixed was to utilise the bikes 'fixed' mechanics in the execution of a particular trick. Or is that too simple an idea? (not disagreeing with above quote btw I'm just adding a follow on idea).