Great question. I'm generally covering rock, but it could be anything from 60s to 2000s. I'm not too worried about the pianos and EPs, or even the organs. Even though I am not familiar with the different models of EPs, I know the K2700 already has great sounding patches for those things.
I guess it's more about the synth and yeah I absolutely plan to learn the ropes. But let me try to think of an example to illustrate. On Styx's "Too Much Time on My Hands" there's a keyboard sound that comes in during the intro, right when the A chord hits on guitar. It sounds like a fairly basic synth sound, but it sounds like there's a phase shifter effect on it. Or something.
On my guitar rig (currently using Helix and Variax for cover songs), I pretty much know how to find a sound that's pretty close and then tweak.
On keyboard I intend to go through all the available patches and familiarize myself, but if I found something close I would not know the next step to tweaking it. Part of that is familiarizing myself with how the K2700 works, obviously, and I've read and watched some videos. But of course, the target audience of that type of thing is usually someone that's already familiar with the concepts, not a n00b.