> But how does this fix the problem that MCAS was supposed to be a band-aid over (That the plane is aerodynamically unstable during take-off, and pulling too much on the stick will cause the plane to easily stall)..?

MCAS is not even enabled during take-off, which makes it hard to see how it could be meant to address supposed stability problems during take-off. It can't come on until the flaps are retracted.