Trabbi you are of course correct
, it's a good idea in theory. It seems to work in Frankfurt, though that may be a cultural thing..?
PM, are you looking at that from a flight deck perspective? Some remote stands can take 15 minutes to drive to, and if any pax go AWOL , which happens frequently, it often delays the all the pax on the last bus. And theres' always the risk of buses not arriving on time, and it also takes the loading team etc longer to get the bags on and off (unless we are talking about FR etc ??)