Pretty much an opposite to the question made in this post. Now, many people on this sub are enthusiasts so this question may sound like a little bit crazy to ask on here. However, you may have a spouse, parent, friend, or some other person you know that isn’t really that big of a car person and may feel differently. Maybe mom is terrified to get behind the wheel of your 707 hp Challenger Hellcat, for example. Even among some enthusiasts or petro heads, I find some of them will set limits. I know some people will get behind the wheel of a 305 hp Civic Type R, but feel the current American Muscle/Pony cars are too powerful for their platforms to effectively use that power (as opposed to something like a mid-engine supercar).
The limit does not exist.
I’ve never driven anything with substantially better power to weight than my car, but I already have to roll onto the throttle even in 2nd/3rd if I don’t want traction control interfering. I personally would have no problem driving something like an R8 or Huracan with the 5.2 V10 that’s been twin turbo’d to make 1200hp. A little self control with throttle application is all you need.