>>458383
>served a technical purpose originally

Red is traditionally used to amplify a warning or boundary- a dial tachometer uses a literal red line to mark the RPM limit an engine cannot go over without imminent risk of damage, and that idea has become a common term for pushing something to its limits even where no such device is in use. The other common use as a danger zone boundary marker on things like maps and walkway/road markings is also used this way where no actual line is visible.

In the examples shown the red line serves these purposes on the camera lens by marking the limits of where you can safely put your fingers without touching the lens itself. On the digital watch it gives a quick visual reference of where the important data is contained- not very consequential on a single watch but if you had an entire panel of displays nested together it can help the eye to organize them and exclude extraneous space when scanning them.

It absolutely serves a technical purpose in some applications and that's why it's used to convey a "high tech" or "performance" aesthetic on products where that's a selling point, even where there's no need and/or its location can't possibly serve any practical purpose. Note that all of those devices are technically advanced items that are seen as "better" if you gussy them up with tech-y trim.

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What's the meaning of the red stripe?