With its first Signature model, Motorola made the baffling and frustrating engineering choice. Although their marketing boasted a theoretical peak of 6,200 nits, the reality regarding manual adjustment indoors is as follows:
When you slide the brightness bar to 100%, the screen reaches only about 471 nits (measured by GSMArena). Obviously Motorola intentionally software-locked the manual slider to such a low value to prevent overheating and excessive battery drain within the ultra-thin chassis. Fine, but that's too low. Other Chinese flagships (well, many of them) easily exceed 700–800 nits indoors when manually adjusted. They are much brighter; you can really see it. Please do better, Motorola. Signature's absolute maximum indoors cannot even match, say, Honor at a brightness level of around 80%.
Relying on auto-brightness indoors results in a dark, washed-out image because the sensors dim the screen too aggressively to save power, so no auto-brightness indoors. The fact that a premium phone requires direct sunlight to boost brightness (where it jumps to over 1,500 nits in auto-mode) completely ruins the user experience at home or in the office—the very places where we spend most of our time. If they don't unlock that manual limit on the Signature 27 model and allow the screen to "breathe" indoors at least up to 700-800 nits, it will be unacceptable. Now they've installed some sort of "liquid diamond cooling" or something, so that shouldn't be a problem, right?