Like most people I have often felt that the presentations were almost stampeded on us while other riders were still scrambling around to finish. Almost disrespectful I thought. However when trying to understand the reason for this it became apparent that the organisers, hated though they may be, must have had good reason for such action.
Just checking the 2003 TT timetable, take Wednesday 4th of June for instance,
Junior 600cc start 10.45 am 4 laps
Sidecar races B start 13.15 pm 3 laps

The times for the above were Junior, first Bruce Anstey 1-15-13 last Marc Bichouard 1-32.50
Sidecar B, first Dave Molyneux / Craig Hallam 1-04-25 last Pierre Duval / Loic Ansquer 1-35-09

Even if we disregard the weather and everything went to schedule then the Junior race would have been won at 12-02-03 pm, leaving 1hour 13 min before the start of the Sidecar race B. Now if they had waited until Marc Bichouard arrived at the finish at 12-31-00 that would leave only 44 min until the start of the next race.
There are many matters to be resolve before the next race, all the marshals must get back and report in and also go out to clear the road again. Fitting a victory ceremony in for the first three riders may be just too tight if they wait for ever rider to get back to the grandstand.
Carrying this further to the end of the day when the roads must be reopened for the residents who may or may not be interested in motorcycle racing. If you do the sums there is a real time pressure on the organisers.
We may be being a little unfair if we accuse them of an unfeeling attitude to the tailenders. They have to try to keep everyone happy, the riders, the fans, the press and the residents around the course. As well, some fans have to get to the ferry or airport.
We have to keep the roads closed for the minimum time possible, as we do not want this used against the TT.
Perhaps someone who was there can correct me with the actual start times due to the weather on that Wednesday.