As you'll see in the video below, with 11 streams of 1080p video at 30 fps in Premiere Pro (and one overlay of the NVIDIA logo), GPU acceleration handles theworkload seamlessly, letting us add effects in real time without any processing delay.
They are bound by custom and a concern that there will be misunderstandings or it will add to their already-full workload (both concerns were determined to be unfounded in the study).