iirc the display engines are built into the AXX chipsets. As only pro phones get a pro chip, Apple probably does not add the capabilities to drive displays at higher refresh rates to the non-pro silicon. So even if the display itself could go higher, the hardware to drive it is missing, not locked in software.
I wonder if the display is technically capable of 120hz+ and they just locked it in software.
iirc the display engines are built into the AXX chipsets. As only pro phones get a pro chip, Apple probably does not add the capabilities to drive displays at higher refresh rates to the non-pro silicon. So even if the display itself could go higher, the hardware to drive it is missing, not locked in software.