Part of the arguement in favour of FW EFTS wis that it is an easier environment to learn airmanship, as the stude is not having to deal with the complexities of simultaneously learning to fly rotary. Clearly airmanship can be learned in a rotary only environment, but my guess that the rotary course would need to be lengthened considerably. Possible that the chop rate will increase, but not certain .
Not sure about the H only aspect - plenty of ex RN rotary guys seem to be flying ATPL FW, and they would have had <100 FW in training.