Well since real cars in the real world have TCS and ABS, and every exotic sport cart made these days have full computers dedicated to the TCS system, and some of them are nearly undrivable without that computer running, well i fail to see how purists or elitist people consider it a cheat to run them.
TCS 1, which pretty much just gives you launch control, unless it is like the 599 or something is basically undrivable without a higher tcs setting. ABS 1 cause lets face it the DFGT's break pedal is so sensitive it is easy as heck to lock the wheels of a car up even touching the break pedal.
Nevermind that heavy settings slow cars down, for most aid systems, if a person knows the car they are driving and can drive it well without aids at all they should be faster in the vast majority of cases if cars are at all equal in performance.
Threshold breaking non abs allows a car to stop in shorter distances. TCS and other aids systems often use heavy modulation to keep the car stable hence you accelerate slower and so on.