Clojure barely let you import packages without restarting the JVM recently in its life.

Can you expand on that? I am mildly experienced with Clojure, and much more so with the JVM and I see no reason for that to happen (besides perhaps some kind of module shenanigans or importing stuff that requires special flags?)

But it has this capability and had it for a while. What's your complain?

Ehh, no. In fact, other Lisps are actually slightly better at hot reloading because they're not hampered by the JVM's limits.

Check out stuff like CHANGE-CLASS or whole image loading.