I will prefix my statement by saying that I was once the proud owner of a restored 1967 Maserati Quatroporte that had a lovely V8 adapted from a race engine for road use, 240 plus hp and a top speed of about 250 kph in a car that weighed something over 2 tons. In its day it was the fastest production 4 door on the market.
For a brief moment, on a clear expressway I had it up over 200 and it was still accelerating hard, I then backed off for love of my licence and liberty
Given modern traffic and police speed controls I have never seen the sense in something more powerful than that unless you want to haul several tons behind you. Couple that to the fact that a turbocharged engine develops full torque from very low revs even a 250 hp car in a 1 ton package has more than enough to win most traffic light Pran Prix, and there are very few places or times when you could explore the upper end of the current crop of supercars (a different thing altogether from a sports car).
We have seen that quite a few PlusSix cars have been written off by over enthusiastic drivers so one almost has to question why they even exist let alone whether or not they should have driver aids.
Just my not so humble opinion.