I do CG with virtually every provider I see. I can't say that I ever recall a provider saying she does not do that position.
Not only is it one of my favorite positions, I know many providers who love to jump on top.

One lady mentioned a bad knee which made it painful for her.  I wish I'd known that in advance.

Another claimed that my large endowment made the position troublesome.  I've recently purchased new eyeglasses, and it's STILL not that big.

I recall it happening two times.  Both times they claimed back problems.  Mish didn't seem a problem, but I don't have back problems so don't know what might or might not work.

Most ladies like CG since they control how hard, how fast & how deep.
I just like the view!
HV