And yet the 1Ds3 with is APS-H sensor had 5fps while the 1D3 with its FF sensor (and released about the same time) had 10FPS.
The APS-H were a legacy of the transition from film to APS-C to APS-H to FF, there were not created so as to give any sort of reach or speed advantage.
Canon dleted the APS-H for a very good reason: it simplified their manufacturing line-up and they likely canvassed a lot of pros as to whether they needed APS-H. Don't forget that pros (unlike a lot of weekend wannabes, myself included) try not to rely on cropping - they aim to get as close as possible and large in the frame as possible. Canon uses that as a guide for their gear line-up not people who use gear to make up for deficiencies in technique.