The pit-kill tactic was developed along with the concept of "reinforcements." In fact, strictly speaking, before the appearance of "reinforcements," the pit-kill tactic could also be used, but the benefits were not as great as later, so it was not common.
As for whether the trap kill strategy would reduce the fun of the game, it was obvious. After all, for the party who was being killed, this was a completely one-sided battle. Under such circumstances, the individual had no power to fight back at all.
The key was that Chen Mo added a new mechanism to this version of World of Warcraft: The battlefield leader could choose to turn off the resurrection mechanism of a certain Cemetery.
In the original Wrath of the Lich King version, although Alterac Valley had a backup system, the dead players would be automatically resurrected in the nearest graveyard. The only way to change graves was to run souls.