The point was that Ben is just snot-nosed kid that got lucky. Had the omnitrix fallen into the hands of someone who has a head on their shoulders, 90% of the trouble in the show could have been averted. 99% if that someone was Max.
It was also a fun little turn around where Ben who lorded the watch over Gwen found out how it felt. Too bad it was a non-canon what if. Even a dream might have actually done him some good.