The differences in results due to differences in developers are real, but they are also quite small.
Same goes with differences in technique.
Convenience may be a fair word to use, but it may also mislead. The liquid developers I use (HC-110 and Polymax T) are more convenient, but that convenience is important because of the limited, non-dedicated space I have available for use.
So it is necessary that I understand the materials I use, and the techniques available to me in the circumstances I work in, in order to obtain the results I want.
If my circumstances were different, the pyro developers might be an easier way to obtain the results I want, but I doubt that the results possible would be fundamentally better than the ones I can obtain with what I use.