Tone controls are usually not just potentiometers, they're additional gain stages. As for potentiometers, on high-end mixing consoles the potentiometers are often better quality than on home equipment, almost any home equipment. Not necessarily for audible reasons, but for longevity under hard use.
Audiophiles get nervous about potentiometers because they're conductive plastic rather than wires or trace. Personally, I'm more of a fan of just measuring the output signals and not caring about the implementation, but lots of people think some electronic components are good and some are bad. Lots of people in the industry like playing into those biases too; there's money in it.