It is better equipped than an M4 or M4 Competition Pack for the circuit, but he wants to dominate more public asphalt, the private one is reserved for GTS. I think that's how people from BMW's marketing understood, even if no one notices them after the car goes out on the doors of the factory.
If a regular M4 can be trapped in some of the less successful things for a street car and the M4 GTS has even got the red card from some of the most demanding M4 CSs, it comes to somehow reconcile his neighbor's goat with his neighbor's cabbage.
It's easier than an M4 due to CFRP components, it has an aerodynamic package that makes it more obvious and the power has increased by 10 hp and 50 Nm. Changes are not high, but they are exactly the changes that an M4 needed to keep up with the news in this class.