Soon after electronics got good enough to build an organ, they got good enough to build the universal machine that Turing described. This is a versatile invention, and still showing us its abilities. Perhaps this leads to an expectation, because the computer can do so many things, it is always the best tool for the job.
There could be a case for some division of labour here. Especially in the musical world, simpler is often better, and more playable too. If you have a keyboard or synth that can create a refined sound, and a computer that's good at crunching numbers, why not let's combine these strengths?.