Gonna throw in my two cents here.
I don't want Avorion to have planet landings, but I do think functional planets would be a good idea to implement in some way. Like an import/export or embassy station and colonization efforts that can be planned out similarly to Stellaris and other 4X games.
Permanent resource mines and risk of orbital bombardment and troop landings, perhaps, so long as the actual planetside stuff isn't represented in the game itself but rather in a simple UI window. Treat it like boarding incidents or something. The only "physical" planet interaction I'd like to see is planets being given a proper hitbox and a guaranteed death if you try to land a ship on one. Spaceships of Avorion's scale aren't meant for landing - leave that for the cargo shuttles and fighters.
It would help make the universe feel much larger than it currently does.