I'm not fond of them either although I don't feel too strongly about it, I'd give this a +1.
Consider this scenario. One side has a a major object down at a field. A player can time to the second when to begin his attack run on the hangar/ord/whatever just by spamming a .dt command. It makes it easier for the attackers to keep the defenders objects down with smaller/virtually no window for stuff to sneak out whereas if there were no .dt commands, the enemy would have to see it to know it needs to be dropped.
If there were no .dt commands, they could be using a stopwatch, and some do. That would require a level of commitment and presence over the area from the start, as opposed to flying to a base and using your MFD to determine and prioritize which targets are going to be available when you get there.
Wiley.