Sure there is no doubt that a scheme doesn't fix everything. You still need a QB that can execute the scheme and sometimes do some off schedule stuff to be really good. And, it also helps to have players around that QB that are really good.
But, some schemes make things easier on the QB than others. Our scheme the last few years has just made every snap look hard. No mismatches almost no really open receivers unless it was an amazing route or amazing speed. So hopefully the new scheme can help that. But, it's not going to fix everything. Even the best scheme needs an OL that blocks well, a QB that executes the offense right and play makers that make plays.