Before Switzerland joined Schengen I flew often (3-4 flights/month) to Brussels. Flight in always went to T-A (Schengen) where we were loaded onto a bus (just one as only 90 of us or so on an Avro and we waited for stragglers), given a grande tour of the Airport and dumped half way along T-B. off the plane, up two flights of stairs, and proceed 4 or 500m to passport control. There was a door into T-B much closer to passport control but the couldn't use it for security reasons.
Of course they were doing for their own convenience and not the punters. But there was no competition then.
Really, how difficult would it to park at T-B, offload us and to tow the aircraft to T-A?