A few things with the Ravaging on Arboria. It's also known that they cannot drill/dig deep enough to kill the planet entirely, this is why things were slowed down as they've been trying to figure that out. The fertile layer of soil is extremely deep and out of their current technological reach. If that ever happens, who knows.

There is still very much an active resistance on Arboria, Queen Mayala is presently still connected with the planet and that's why her health is as frail as it currently is.