I think it's more of an extra layer of help. Only this last time, when I initially cranked did it need burping. So to avoid additional issues, I drilled a 1/8" hole. It seems to help with getting the air out. This is a modification. I thought yours was out. I don't know if opening yours up is necessary. If it were me, I'd try first without.
Consider when you put a new thermostat in down the road.