TV’s using this tech such as Samsung QLEDs have blooming issues as well and those are much better quality than Apple’s displays. Apple didn’t do themselves any favors adding more light in the form of miniLED while still using poor quality panels.
Samsung QLEDs have more blooming because they have less zones - it has nothing to do with panels themselves, rather with the number of LEDs. They counter this with aggressive algorithms that crush small detail - which is not what you want. Most of things Samsung does with the screens across their devices is to make them "seem" nicer, at the cost of accuracy.
Also I don't think their screens are better at all, let alone "much". The panels on these MacBooks are not "poor quality" in this regard, in fact, they have much more dimming zones than any TV (not counting self-emissive displays). And they have much more accurate colors than Samsung's oversaturated QLEDS with overexposed EOTF curves.
These MacBook screens are only poor quality in the MacRumors alternate dimension.
While Apple may have some of the better displays on the market from a color accuracy standpoint, which isn’t saying much, Apple still has terrible response times on their panels which often negates ProMotion tech.
Color accuracy and contrast are much more important on a pro computer than response times. These are not gaming panels. Also, the response times do not negate ProMotion.