There are degrees of speed. Some people consider a fast concentric the fastest they can say dumbell bench a given weight while still making sure they can feel their chest squeezing the weight up.
Others will just blast the weight up, maybe with a controlled eccentric, maybe without, but usually the movement is so fast it is impossible to “feel” the muscle, in this case chest, doing the work, at least concentrically.
Personally I have found that the second method leads to much better strength gains, but does very little for putting on size. Conversely, I find the first method to be quite good for putting on size, but quite poor for strength gains. In fact, it seems that each method is counterproductive to the other.
I’ve gone from benching with good form but just blasting the weight up to benching while trying to feel my chest do the work. Usually I am terrible at getting my chest to squeeze the weight up and, not being used to the TUT, fatigue very quickly. Then when I try to go back and do heavy, fast reps, I seem to have lost alot of explosiveness.
Do you feel your hamstrings squeezing the weight up on a powerclean? Probably not. You might mention a deadlift and say you feel your glutes there, but that is only because there is a dead start without the benefit of an eccentric, so you basically have to squeeze it up.
What I find is that it will take a long while before you can squeeze up the weight that you can blast up, however once you do, you will be alot bigger.
Look at olympic lifters, sure some of them are put together, but not all. I think it takes a pretty special athlete to pack on alot of muscle using explosive reps primarily.
I believe for most people, feeling the muscle you are trying to work is going to result in more size almost every time.