Either way, they're making the moguls either directly or indirectly by not grooming. So my initial question about why they'd "do that" to Thor which tends to be a run people like to race down still stands.
Yea that is a valid concern. They should leave the mid section untouched with moguls or put it off to one side like Nubs Knob does with theirs. An entire run (a popular one) full of moguls is not necessary and it kills the fun for a lot of people.