Well, some people think failure is the best teacher. As an example the first generation of german rocket engineers whose work culminated in Saturn V and thus enabling the first moon landings basically started from scratch.
It's fine to just half-ass it if the interest is only superficial or for a hobby. Otherwise it might create a very unrealistic expectation in the student, because the gained knowledge by doing it like that is pretty worthless in a professional setting
But if one is to study rocketry without an aeronautics degree I'm guessing it's better to start from hobby level engines and vehicles and then scale up.
There is lot of added complexity due to size and mission constraints that is vehicle specific in Falcon Heavy, and I'm not sure how one would even use it as a learning platform - unless there is a university curriculum built around the vehicle.
There are lot of basics that model rocketry probably gives a good intuition for but then to my limited understanding it becomes (drumroll) rocket science.