Quantum physics is so hard because nothing is real in quantum physics. Everything is real when you measure but prior to it everything is probabilistic in nature. This is hard to conceptualize,nonintuitive and even harder to develop mathematical model which best describes the phenomenon. read more
Some of the people studying quantum mechanics are going to go on to become physics researchers, but my guess is that that is a tiny, tiny fraction. A small fraction of those who learn QM go on to get undergrad physics degrees, and a small fraction of them go on to get postgraduate physics degrees, and a small fraction of them go on to get jobs as physics researchers. read more
The reason why quantum physics is so hard to understand is that the whimsical names of discovered particles during the sixties simply adds to the confusion. Humans think though development of a picture of the minds eye. read more