Shocker, metaphors aren't perfectly analogous when you start being anal about the details.
Sure you train yourself to backflip, but there's different strategies involved if you can't, but given that riot are the ones who get to decide what your physical limitations are, then it's irresponsible to group the players who are asking to be allowed to backflip with the players who have no interest in backflipping even if it's is introduced.
It just frankly has NOTHING to do with skill, it's down to preference on how the game is played. Some chess players prefer to play with a timer, others don't, and if they feel that the game needs to be innovated, they create NEW alternatives rather than replace existent rules ( https://en.wikipedia.org/wiki/List_of_chess_variants ).
Ultimately, they're not forced to play together and those desiring change get new content, but riot still enforces play between these players and will actively appeal to one set of players introducing content at the expense of others by removing content.