Little Bike Big Question Of The Day

Why would a little mountain bike for a 5'3" person use bigger than 26" wheels?  I get that the builder builds what the customer wants, and using 650B wheels is  not quite as wrong as using 29" wheels--and I've seen average height and shorter women on 29ers, and it looks stupid and uncomfortable.  I guess it can be done, and the RL looks neat, but it is something I will never understand.  Tune in next time...