Limitations of sensored motors?

Why is it that all the high torque high watt, low kv motors that you 8th scalers use are all sensorless? Why don't you see (m)any in sensored? Is there something with the design of a sensored motor that limits its capabilities? Or is there just not enough interest in them to justify building and marketing them? I'm assuming the novak HV is sensored, and I know they and LRP cater mostly to 10th scale racers and the sort. Also in some other forum, I was detailing what I have planned in my stampede build which included an lrp a.i. with a x-11 9.5 motor. Anyways someone listed one of the cons of that as it being sensored as well as underpowered. For what I want to do with the stampede, I really don't want that much power, but whats wrong with sensored motors? I have a mamba max system and I have this, though not running yet, sensored setup, and I have driven a few sensored setups and absolutely love the smooth control of it. So I'm confused, why is sensored considered a flaw? I wish castle would incorporate a sensored port with their speed controllers as I wish my mamba had the smooth take offs and low speed controllability that sensored systems have.