In defence of my colleagues in ATC, may I remind those at the pointy end that we are there to get you on your way ASAP.
YOU, "should" have ALL your pax on board ready to go for your ETD. That your CTOT is not the same...ho ho does NOT mean that you can be lax in loading, and YES YES I DO know that "handling agents" can be a pain.
BUT do not anticipate a delay, 'cos you just "might" get one
we aim to please, it keeps the cleaners happy