Just got a new phone (OnePlus Nord 3), turned refresh rate HUD in developer settings and I see some parts of the system and some apps display 120 Hz but I have problem noticing any difference, same with my wife’s Redmi Note 12, i have to look very carefully and maaaybe I notice some different, not sure
60 to 120 Hz is definitely noticeable to me; when scrolling, it makes a big difference. When my phone auto-switches to low battery mode and to lower refresh rates I can usually tell the difference very quickly.