Sigh - I've had many years of experience twiddling knobs and switches. It's second nature for me. Sure, some tunes leave no time for mid-song twiddling. Other times I do have time. I've heard three pickups in parallel. Yes, it's blah - when all the pickups are on a master volume. But just like a Les Paul, reduce one, the other pops. Flip to bridge or neck, worst case is a quick vol/tone increase/decrease.With a Les Paul, how much experience have you had putting the switch in the middle position and then varying the mix and tone using all four knobs? I have a lot of experience with it and found that whether with modern or traditional wiring that it didn't really buy me too much. I find myself mainly going from using neck, neck+bridge, or bridge, via the switch, and mostly using either neck or bridge. I do use the volume knobs and tone knobs, but don't find it ergonomic to just sit in the middle and adjust via the knobs. Faster and easier to mostly use the switch and then slightly tweak with the knobs after that.
I would think that three knobs may be similarly less ergonomic and useful than you might think. It's way faster to flick a switch than to turn a knob, never mind three knobs. Also, all three Strat pickups in parallel is a pretty blah sound, IMO.
On a Strat, it's even more ergonomic. I've been this way since probably my first 1-2 years of playing - which was many years ago.