I agree with spiking being illegal, it's more of a permanent injury slam with less momentum in the throw motion and in the air, means less force.
Slams should be legal. Gets too complicated if you ban them, as some throws could be seen as such, even Judo throws, and with such a motion the only thing you can really control is whether or not it's a spike, since your opponent moves in the air and also decides how to land.
It's the opponent's responsibility on how to land. To train for it. Rose made a mistake going for a sub.