I really don't argue with people who don't have much first hand knowledge of the subject.
I'll add before I go, that you don't work the position just to gain strength. You do the work to have strength in the position. To have a solid platform to move through.
Holding a ma bo for 5 minutes in a fight is ludicrous. Its ridiculous to even use it as a point of arguement. But I can't even say how many times have I seen people fight where they can't keep their legs bent for more than a minute without failing. Or Walking in stalk straight either on their tip toes or bow legged holding melon balls.
Do some stance work, then come talk to me about it.