[rivo]

This is also my experience. I'm not a DJ but I perform live electronic music using various MIDI controllers. If I quickly want to add or remove a sound, like a kick drum, to/from the mix, a slider is best. If I need fine control over a parameter, like a low-pass filter frequency, a rotary controller is usually better for the reasons you mentioned.

As alluded to in the article, rotary vs. linear seems to be a proxy for the circuit which actually influences the sound. I would think that anyone claiming "mixers with rotaries always sound better" does not fully understand how they work. There's a lot of those kind of claims in the music scene.