Opsbod,
I do see your point about not wanting to cause further delay by the FD not being there when the a/c returns. But it's so rare that 2 hours delay at the time of departure of the inbound a/c can be miraculously shrunk to 30 minutes by the time it arrives! So, what I'm saying is that it is better to delay us by let's say 1 1/2 hours in that sort of cases and not have to have us go into discretion - and having to give us longer min. rest period as well sometimes, because we report too early.
Also it really is a myth that a/c can make up a lot of time. 15 minutes maybe, but we can't just click our fingers and fly faster! Even the turnaround time has a limit because the pax don't load 10 times quicker than normal just because we're in a hurry, either. We do try to help by speeding things up, but...