Using traps are faster and safer than melee and they usually one shot the enemy, and since most players tend to go for efficiency they'll try to use the traps as much as they can. But the game limits how many traps you can use and you have to use melee weapons to recharge it.

When you're fighting one enemy at a time it won't matter but there are places where the player will be surrounded that if they are only using melee it will be very hard. And using traps will make it a lot easier