Yep, it very quickly becomes a question of what exactly you're trying to test. If you take energy and power density out of the equation by allowing unrestricted access to external fixed energy delivery infrastructure, the only thing left to test is traction management (assuming you're not allowing things like adhesive tires, cog rails, active downforce, etc.). If you do start to allow those post-traction things, you are as the stage where you might as well build a railgun.