This has been discussed so many times: GSX cannot possibly assume you will start it with Boarding and there might cases where the first thing you do is Deboarding, for example after restarting GSX for any reason, that's why the carts used for Deboarding are already there, so you won't have to wait for them.
Ah ! Ah ! ... "There might be cases" ... I would be very curious to know them ! Anyway... so, for hypothetical reasons, you think it is clever to have these carts being there and then, that they go away, while 2 other trains come from somewhere, when you decide to start boarding ! Very realistic !
Why not, in this case, to also put there, 2 catering truck, one fuel truck and maybe later, also the water truck... etc... And so, if for "any reason" you have to restart, peoples won't complain about the necessity to wait long for these vehicles to come back !
For de-boarding, you can even avoid them to travel like during boarding, you could perfectly spawn them on their positions, when the user select the arrival gate. In fact, exactly like it is now with the marshaller (you don't have it initially, but only in case of arrival gate selection)!
Sorry, but it is difficult to agree with such an argumentation.
The correct solution to this is to act on their initial starting position in the airport profile, to adapt their position to the airport details and other vehicles.
Solution ?!? What solution, to what problem ? Interferences with static object ? I didn't complain about that ! As you say, this can be avoided with the GSX editor and I know it since long.
I just do a proposition which I though was a good one, to improve the realism, to also reduce the number of objects, to reduce the probability of these carts passing though aircrafts, trucks, etc... Even my passengers boarding from the floor and walking on the tarmac !
Do-you realize, that during PAX boarding, you have FOUR of these trains, travelling on the airport, most of the time, performing silly trajectories ? Yes, interference with static objects can be avoided by editing the position of these objects, but almost nothing can be done about all the objects travelling problems. So less we have travelling objects, better it is, to my humble point of view !
Please, next time, just say you are not interested by my proportion, instead of trying to dismount it, and please, do not continue to argue ! I give up ! Like I already gave up to have, one day, the crew boarding separately from passenger and other stuff's.