Well lots of nutrients these days are formulated with PH stabilizers like Advance Nutrients & Earth Juice Sugar Peak so if your using those kind of nutes with soil they say there's really no need to PH, however the saying "Its better to have and not need then to need and not have" comes to mind, I'll still be checking my PH thank you very much, lol.
I bet you guys are using soil because if your doing hydro and never check your PH you got balls.