everything teaches how important setup is
what f3 (and fford before it) did was involve drivers in cars with a far greater number of variables at an early stage, and teach engineers how to handle said variables and experiment to find gains.
by making single make series easy to set up as a way of levelling out competition they’re killing off real engineering training and reducing driver education to a very basic level. so you get engineers who don’t know how to tinker but can use ms excel, and drivers who don’t know how to feel and understand different changes in a car beyond the very limited stuff you can change outside of even current f3.
everyone loses. but it’s a bit like the old airport security “theatre”, you have to be seen to be doing something to reduce costs, even if it doesn’t work and you know it won’t.