Actually, from a software standpoint, the code used to control the back-driven yokes and thrust levers on the T7 and B787 is more complex than the A320's flight control code in its entirety.
Boeing doesn't "backdrive" the thrust levers on any of their airplanes - it moves the throttle to obtain the desired thrust - unlike Brand A, the throttle position
determines the thrust setting. The autothrottle drives the throttle to the position necessary to obtain the desired N1/EPR, operating closed loop on the FADEC provided N1/EPR Command. The logic is in no way complex, and hasn't changed a whole lot since the early 757/767.
Yes, the yokes on the FBW 777/787 are back driven - which unlike Brand A provides the pilot a tactile input to what the airplane is actually being commanded to do . But to call that back-drive s/w more complex than the entire A320 flight control system is dubious at best.
Which is all pretty much irrelevant to discussion at hand which is about the A320 vs. 737 (of course the 737 doesn't have FBW)
