We favour the JIT interface to be used as
jfoo = thunder.jit(foo, transforms=[A(), B(), C()])
rather than
jfoo = thunder.jit(foo) ; jfoo = add_transform(A()); jfoo = add_transform(B()); jfoo = add_transform(C()); .

In the second pattern, A is applied 3x and B 2x. Also it is unclear what should happen to other parts of compile data.

Thus I propose to remove add_transform.
We do use it in some of our tests, but it should not be too user-facing.