It's not laziness!

It's the fact that shooting is enormously expensive per-minute, and time-constrained. Think of the sheer number of crew involved. And then think of the sheer number of shots you have to get per day, to stay on schedule and on budget.

If there was a mixup and it's going to take half an hour to get and set up a longer hose, it's much cheaper to have 1 person do it in post if it takes a day, versus delay the shot for half an hour while 50 people wait around. (And no, you often can't just shoot a different shot in the meantime, because that involves rearranging the lighting and set which takes just as long.)