Functional bikes. Not Porn not Anti

Ok but you don't take care about BB high is just for pseudo "VERSATILITY" ? When you can put 650b 2.3 tires or more I don't understand why it's interesting to put 29ers wheels with 2.1tires, ratio, BB high are changed. It's like putting 650c wheels in place of 700c wheels.
Where are the interest I don't know.

I read that 3 times.