I’m not sure I understand what your complaint is.You mean the display that doesn't run at 120 permanently because Apple won't admit what it would do to the battery?
'pro'motion my ass
A lot of video content is created at different frame rates. 24fps is widely considered the best frame rate for cinematic content, films shot at higher frame rates feel off a lot of times even as certain tracking shots are less juddery. US broadcast and VHS content was traditionally at roughly 30fps, a neat division into 60Hz US displays. Among other differences between NTSC and PAL, US and UK TV felt different due to frame rates - PAL displays are 50Hz, with 25fps as a common frame rate.
Live sport with lots of movement looks better the higher the frame rate you shoot and present it at, and video games suffer less input lag which is why gamers harp on about FPS above many other metrics. Meanwhile, if you’re reading a static screen of content, how will more frames help?
This is an oversimplification. Variable refresh rates that react to the required frame rates of content being displayed are the better solution for battery life _and_ for the content itself. Why refresh a screen multiple times for the same frame of information if you don’t need to? How is doing so “pro”? How are Apple hiding the battery implications of screens that always run at 120Hz? It’s a driving factor of variable refresh rates in ProMotion!