I don't think it's that they don't understand how to fix it, but rather that they literally can't. As much as it seems like SE is dealing with a bunch of idiots on their development teams for all games from the last 5 years(EXCEPT, of course, Kingdom Hearts games and The World Ends With You), I don't think they are.
It'd probably take some of the original developers and scripters to change such a fundamental code in the game. That would take a huge amount of effort and money to do.
Plus, there's always the chance the new system is worse than the old, and then all that money goes to waste because they lose memberships and have to redo it again.
