When are stabilizers required (compound bow)

Novice question.

Do you really need stabilizers for 18m indoor target.

I see the top guys with 8-12 pounds of total bow weight shooting 18m and I can't help but question it.

I find I actually shoot 18m better without any stabilizers on my PSE Drive 3B with a total bow weight of around 4 pounds.

Now this could just be because I'm new to the sport and my best isn't very good, but what have you all found better at 18m?