Pattern setup is not only done on the plane but the transmitter also.
Increased stick tension can help the dreaded cross controls. Adding expo
to your surfaces allows a small mistake on the stick look smaller in the air.
Mixes can help remove some of a planes bad traits (not a crutch for improper setup),
some planes have quirks that can't be removed without major redesign and that is where
computer mixes really show their usefulness.