Ever tried to find the distinction between a craftsman and an artist?

You seem to imply that taking existing knowledge in order to solve a problem is a bad thing. It is just as creative but in a different way.

during the born of the quantum theory the practitioners pointed out with they experiments many evidences that could not be explained by the classical theories. This induced the physicist to start thinking to a novel theoretical framework to explain the weird experimental results like the dark body radiation or the photoelectric effect

In wildlife conservation, good field data lead to good models, and further theoretical thinking. Practitioners think as much as theoreticians - but theoreticians may not have the ability to implement their "inventions" - we see this regularly with untested population and habitat models. Practitioners may test some of these theoretical models, adapt them, and come up with solutions based on real data. This is then reviewed by theoreticians who formulate new thoughts. So, practitioners do contribute to the inventions of science!