When i did standing ohp for high rep, it seemed like right below trap would start to cramp up,after around a dozen reps unless very light weight.
Also with heavier weight the back of right knee, would hurt.
At my age you take note to exercises that hurt .
Kevin levrone had some of the thickest shoulders, (to compansate average clavicles ), used smith ohp press as staple in his training
My coach used to have me put bar on highest pin in power rack, squat under bar with arms locked out, then stand up, move bar 5 inches or so, before ohp. Which is the equivalent of doing a heavy walkout before squat attempt. Anyway awesome exercise made the ohp weight feel lighter.
So yeah i totally unstand.