Yes a lot of top officials look at everything not just shots but it is the inexperienced officials that rationalize their stalling call with just shot counting and verbally express that to the coaches. The coaches then use that same rationale to try and get a stall call. Same as a wrestler not coming off the hips. While this can be stalling it does not define it. There are several moves where the wrestler on top can turn his/her opponent without coming of the hips.
Backing up, Not taking shots, staying on the hips are all good indicators for stalling but are not absolutes.