There are different reasons why pads are not recommended for use on the street, but getting enough heat into them isn't always it.
Tesla is not going to put an extreme pad in their 'track pack' because they know most won't want to swap pads in and out.
What you define as a 'track pad' might be quite different to someone else in any case.
If you go easy, you can use the standard pads on track and I've seen owners who have done that without any problems, but they haven't been driving very fast. I think the track pack is aimed at that sort of owner.
Anyone who's done their research knows that Tesla's track pack is just a marketing exercise. If you're serious about tracking your 3 you won't want to use the pads they're offering. In fact, you won't want the factory rotors or calipers either...