The galleries set the terms of the exhibit. I find these sort of things extremely annoying too, so I just make the stuff up. Look, who knows what my intent is when I'm painting or drawing? I don't need no stinking intent, I just need to do it right. But, the gallery people are doing their job of being ridiculous sales people, and so I do my job of gritting my teeth and giving them what they want, or I show somewhere else. It's a waste of time to try and convince someone that their way isn't right.
You're going to meet a lot of weird people in the art world, especially on the retail end, but the gallery scene has not one thing to do w/ art. It's simply how the art is exhibited and sold to the public. Some people use an artist's agent (art pimp) to deal w/ the gallery people, and it's a good idea to go that route if you can find the right person.