Being "whoever" in another life and occasionally these days, we have enough guitar gain changes, uneven keyboard patch changes, vocalists waving the vocal mic all over the place, and yes, bass changes, even on the bass's controls to chase after. And the varsity guys deal with all that without complaint (for the most part)I also assume whoever is running the mixer can’t be bothered to move a slider.
So we appreciate the efforts of someone like the OP that wants to simplify his bass gain changes. It benefits him/her and us as well.
And it's "fader", not "slider"......
(Your point is taken and appreciated, though. Seriously. Cheers.)