Could be.

It was tough to hold onto it and keep it perfectly flat. If it
lifted(or torqued) even a little bit, snap. I was cutting through 1/2"
OSB. On drywall, you are right. I cut nearly all day with a single
bit and had no problems. Drywall will mush around a little bit, but
there is no give in OSB(comparitively).

Just my experience. FWIW.

JW