> And it is disabled on most clients This is not correct. It's a part of the consensus system rules and cannot be just enabled and disabled on a node by node b

> And it is disabled on most clients This is not correct. It's a part of the consensus system rules and cannot be just enabled and disabled on a node by node basis. It must be preformed precisely and identically on all systems. What is the case is that nodes don't relay transactions with unusual scripts to prevent DOS attacks, but once they're in a block they're fine.