In a perfect world it would be that easy. I could do complimentary paint jobs and cam upgrades and free alky/meth kits or E85 conversions or even buy stickier tires for cars that make good power but can't hook if they have any IPS parts or stickers on them or whatever. It would literally never end...
I can count on one hand the number of cars that the customer has given us free reign to simply "Build it". In those rare instances, anybody can feel free to critique or analyze or pick-apart every last nut or bolt if you would like. Chris Anderson's Z06 (The black one from Texas) is one such an example. There isn't a single facet of the car that isn't exactly how we would have built our own (Except maybe that he wanted to go SC instead of TT). Almost every other car/truck that has come through could have always been better in many different ways. Body / Paint / Tires / Engine mods / Turbo choice / Injector sizing / Tune / Interior / Etc etc etc etc etc ....
Back in the real-world where budgets exist and I don't get funded by Microsoft, it simply isn't possible to make every car "Perfect" or as "Good as it could be" while it is in here getting work done to it.
Jeff