What they should be doing is making it possible to grind off any mob types and not just the ones that current have high base XP values. (Raptor parties I'm looking at you)
They can't control us. They can't produce a situation where monsters are equal, without actually making them all homogenous to each other. If SP is universal, we will figure out a monster type that has least bad moves, a camp with most mobs, the variables are numerous and we will figure out another. Then the developers are left to try to figure out what we find out next.

That's exactly what they shouldn't be doing, since its a bottomless pit. They need to control us, not try to guess what we might end up doing next.

Previous to the SP fix it was (Coblyn parties) whats next ?
It goes on until they stop trying.