I’ve looked into those. The good ones have a really short threaded bushing and are made to mount in a plastic pick guard. They’re too short for the thicker surface of a wooden body.
The concentric pots with longer bushings that I’ve been able to find look to be really cheap pots.
I’ve considered trying them out, just to see how well they work, but I’d likely have to drill the holes larger for them. If I didn’t like them, I may end up with holes that are too large for more normal-sized bushings.
They aren’t off the table, though.
The other thing is familiarity. When I play, I just reach down and rotate the knob with the edge of my pinky. I don’t actually twist the knob with my thumb and forefinger. This allows me to adjust the controls while keeping my pick grip constant.
Having individual knobs allows for quicker, on-the-fly adjustments.
In a way, I’m a Ted Nugent sort of player. In live videos I’ve seen of him, I see him make frequent sweeping motions across the lower part of the guitar as he adjusts controls and the pickup switch (the pickup switch is in the lower horn on a Gibson Byrdland). SRV did similar things while playing his Strat. I chuckle when I see that because I kind of do the same thing - frequently manipulate controls through a song. I’m definitely not a set-it-and-forget-it kind of player.
