There are at least two problems with this. First, the history of tuning suggests there is no level of stock performance that enthusiasts will be happy with. The

There are at least two problems with this. First, the history of tuning suggests there is no level of stock performance that enthusiasts will be happy with. They will always want more than the OEM provides. Secondly, there’s a reason you see this with EVs (Tesla’s “ludicrous speed” mode) but not ICE cars apart from “sport modes” and the like: the ICE cars can’t be offered with the knob you suggest, because the car has to meet emissions requirements at any tuning level, and any level of tuning is going to have a performance/emissions trade-off.