Agree with both of you and need to invest in some knee pads/wraps myself. Coming from so many years of distance running, lifting has been a huge change. I’m not so sure that 315 on squats is that bad and most likely does the job, mixed in with other leg exercises, for a great leg workout.
Hell, I like the hack/back squat HammerStrength machine at my gym more than I do throwing that bar on my traps/neck these days.