Hi and thx for the question. The mothership is unique as it has two simultaneous drop off points. So when your carrier or mobile refineries are the only ships, with their single drop of points at a big asteroid field, where there are 4+ nodes for harvesting, than yes, one more ship with a drop off point is beneficial. BTW have you joining the game's Discord channel or my own? You can more easily find players to play with there.
