The only high-end display I have to compare it to is my Galaxy Tab S7+, which has VERY noticeably smoother and less ghosty/smeary motion. But the MBP 14 is still noticeably better than 60hz displays. I mean, all you have to do is switch to 60hz and you can see it's smoother with ProMotion enabled.I was at a store the other day which had a 14" MBP connected to the 27" Studio display. I was dragging a window around from screen to screen and the MBP was considerably smoother and cleaner with less ghosting than the 27" Studio Display which is stuck at 60Hz.
The current MPBs are heralded as the best professional laptops ever made. I am sure for a select minority, who have become aware of this issue, and also appreciate low-lag screens, then you may fixate on this apparent 'issue' (hint: it's not an issue, it's just not the same as other high speed displays).
Apple have focused on what's important on the displays. That being colour accuracy, colour gamut, and contrast/brightness. These MBP displays are incredible to look at. Could they be even better with faster response times? Sure. I mean, lots of things COULD be better. They COULD be thinner. They COULD be faster. They COULD do XYZ, but they don't.
When I was in the store, I was surrounded by laptop and desktop displays. I genuinely question how people can accept what the Windows PC's come with in comparison to the Macs. Even the Macbook Air with M2 has a substantially better display quality than practically all the other devices in the store and it is just a normal LCD. It is quite like comparing Apples to Oranges actually.
A decently smooth screen combined with top-class color reproduction, HDR, contrast, and reflectance is more than okay in my book.