Anything other than a straight rod from servo to surface in a high-loading situation can create a potential for the bent rod to bend more under the load.
At full surface deflection the manuvers will be extreme enough that any minor differences in deflection can be removed by the other controls.
It's only in precision flight that getting the controls exactly identical that it really matters.. 3D stuff is so full of couplings and crossed controls precision in surface position isn't that big a deal.