Systems must evolve or they go the way of the dinosaur.
Every MA systems evolved from another form of H2H or whatever.
No style can or should become so stagnant as to NOT see what is useful from another system or to see what is needed to change to deal with a "new puzzle" that may have to be solved.
If anyone thinks the WC of today s like the WC of 50 years ago or 100 years ago, they are smoking some nice drugs and NOT sharing and that is just not cool.
Psalms 144:1
Praise be my Lord my Rock,
He trains my hands for war, my fingers for battle !