The added Power Fractal is actually "inside" the planet object, but without connection to the compute terrain node or the surface shader input of the planet.
I can only speak for myself, but you can get around this with creating your own default file to load at startup with only a power fractal. Which i would suggest also for "better" settings to start with.
(Also, however, i don't really understand why the default settings have a heightfield instead of a nice power fractal.)
In my opinion a good startup is without any heightfield. In my default is only one PF for starting the Terrain and one for the surface (deactivatet, as the compute terrain node) and the athmo samples are set to 8. Also i deactivated some other settings to get more performance on test renders that only should display how the terrain looks like.
If anybody wants to take a look, i can post this file.