As a writer, many years ago I conceived an idea that a planet was a dragon egg (well a dead dragon that wants to be reborn if we are to be very specific), that desired to devour souls of races that lived on it in order to "hatch", and to get more souls it connected to other planets to get their souls (biomass in Stellaris terms).
Wilderness + Behemoth kinda allows that fantasy, so suffice to say I too wish this restriction gets removed (yesI can just remove it by myself, but I'd rather not clutter my mod list any further).