The mechanism superseded the traditional scissor design of earlier Mac keyboards and first appeared in the 12-inch MacBook, but it was "meticulously refined for greater comfort and responsiveness" in the MacBook Pro 2016, according to Apple.
Be that as it may, a growing number of MacBook Pro owners are complaining about an uneven pitch between different keys.
One user has posted a video and recording demonstrating that pressing some keys returns an acceptable muted click sound, while the Caps Lock key returns a higher-pitched snap, reminiscent of a typewriter keystroke, albeit quieter.
The peculiar clack might be a minor annoyance to owners, but if it's as noticeable as the demonstration, they might be conscious of pressing the noisy key in a quiet place like the library, or in a cafe.
As MacRumorsreports, the snappy key issue seems to occur when the laptop is warm, and several other owners have also been able to reproduce the issue in this state. However, others have reported the same issue on a cold Mac. One user reported that the snap-prone keys are Caps Lock, left Option, and occasionally the Delete, H, and C keys.
MacBook Pro owners have also reported several other issues with the keyboard, including non-responsive keys, keys that double-type, and an uneven feel, such as some keys feeling spongier than others.
MacRumors speculates the high-pitch key issue could be caused by something as simple as dust caught in the butterfly mechanism. One key on its own model displayed the problem, but cleared up by itself.
The publication notes that Apple is replacing Touch Bar models suffering from keyboard problems, while designating non-Touch Bar models for repair.