One hand on the keys and one hand on the knobs is a very specific way of "playing" a synthesizer. A lot of people don't really play the instrument live in this way.
I, personally, don't use keyboards to drive synths at all (even when the entire piece is written for synthesizer). I tend to work entirely in the box with step sequencers, and record directly into my DAW, where I go about rearranging things and mixing. So there's really no "playing" involved, and I've found it a lot more profitable to study composition and orchestration.
I, personally, don't use keyboards to drive synths at all (even when the entire piece is written for synthesizer). I tend to work entirely in the box with step sequencers, and record directly into my DAW, where I go about rearranging things and mixing. So there's really no "playing" involved, and I've found it a lot more profitable to study composition and orchestration.