You were in the open back in the day, and if you stop PvP to feed pets, your either dead, and or your target is gone. say all follow me, and feed your pets? Get dumped on. Please show me how to defensively stay alive while dragging meat to your pet. Or when trying to kill someone. Have to stop and feed them.
It was harder back in the day to run a single drag with commands, then the current greater drags. So now run 4+ of them. Thats a lot of keeping track of which one needs feeding, which one is gonna go wild, which ones are not listening. You say all kill 3 of 4 get on someone. So what do you do. Of course you wanna kill them so you say all kill again. the 4th sicks on there, but 2 others bark. So now you got 3 pets down on loyalty. The target drops invis item. All pets standing there. Rinse and repeat. 4 or 5 invis, an either you stop and they get away, you stop and you die, or have to play defence, while you worry about feeding your pets before they go wild, and turn on you (since most times your closer)