Why are 100mm bbs not used on bikes for big guys? Generally speaking the pelvis/hip width for a guy 6'4" 250lbs is larger than a 5'10" 130lb guy. Seems like the wider bb will position the pedal stroke in a more ergonomic position than a 73mm bb. I know that this difference for the big guy can be lessened by using cranks with different q-factor but why not use the 100mm as a starting place to pick the right q-factor cranks? The 100mm will also increase heel clearance with the chain stays if the rider has large feet(like me, size 50). Negatives are less pedal clearance to the ground in turns and perhaps a bit more stress on the st/dt bb area because off the wider lever(spindle). I am posing this question for a rider that typically will tour/commute/adventure but not do any racing or "radical" riding. What are your thoughts?

thanks, Brian