I guess if the roads you ride on are super smooth those higher pressures could work. Up to 120psi sounds like a LOT though! I used to bang 100psi into my skinny road tyres years ago, but these days I am slowly coming around to the lower pressure thing.
https://silca.cc/en-au/pages/sppc-form
On 25mm (tubed) tyres, I tend to run 85/90psi F/R which "feels" around the sweetspot for me. I am a lightweight and the roads are fairly rough around here.
(zero scientific testing has been performed by me to prove/disprove this)