How many times have we come across a closet or cupboard, and said "Okay, probably a zombie box. Shoot it with an arrow and we'll clear it."
How many times have we looked at a room and said, "I bet the floor collapses. You hang back, I'll go in, and when it does you back me up."
How many times have we come across a room with loot in it, particularly the treasure room, and said, "This is an encounter room, lets switch gear real quick and do a different tactic."
EVERY SINGLE TIME WE CLEAR A POI. That's how many times. 100% of the time.
There is no real surprise in the POIs any more. Just set pieces that you clear, each with a particular tactic. As it doesn't even spawn zombies outside the immediate area, you can go as loud as you like right outside an encounter that would be packed, and have no fear of a swarm descending on you. No need to ever adjust your tactics due to the situation in the area.
Clearing POIs is very formulaic at this point.