RE: Why should fructose be avoided PWO?
It will just replace liver glycogen, and not ellicit a insulin response to drive glucose into the muscles with other nutrients. If the fructose is from a fruit, there will be glucose in there also, and that will still go to the muscles as wanted.
IMO this is still basically fine for PWO, as this allows for the insulin response followed by slower carb release, but a dext/malto mix is probably better.
If it's refined fructose (can you even get that?), then PWO would be a waste really.