I agree with the rest of your post, but this statement in particular shouldn't be taken as a given.
The WCA exists to serve the cubing community, and as such, it absolutely should take into account what the cubers actually do in solves. For instance, hypothetically, introducing a new regulation at this point that would greatly advantage one popular method over another popular method (… e.g. banning table abuse) would almost certainly not happen unless it greatly improves some other aspect of the competition (e.g. does it make judging more consistent?). However, if said new regulation somehow only affects oddball methods barely used by anyone, there should be a much lower barrier to introducing it.
It's interesting that you bring up card games. My understanding is that when certain cards are discovered to be too overpowered / game-breaking, especially in unforeseen ways, they do get banned for later tourneys. It might not necessarily be that players are unfairly disadvantaged (assuming it's not a rare card, everyone could just stuff it in their deck to even the field), but that it makes the tournament less interesting, fun or exciting. To be clear, I don't think this specific situation is a good analogy to banning table abuse, but it's some precedent that rule changes can be made to accommodate changes in the meta.