Well, there is an issue of having not enough time to brief the preflight on some occasions. At least where I fly. Everything is streamlined to the minute.
But if I need more time, I will simply take it. Hold the PAX at the gate, sort out technical issues or what ever it is. Brief longer, if there is a need for it - usually I try not to be as boring as some of my colleagues, but there might be some special occasion.
And then we board late, we take off late, and we get there late.
No problem. Noone bothers me, and FDP still starts. So sometimes the company will have to call a standby to cover the last legs.
Still, noone bothers me or writes me a letter.
Usually time is enough but tight, but this just might happen.