[growthwtf]

I think it's an interesting correspondence—some general design principles about creating good auditory user interface somewhere in here. I would be interested if someone smarter than me can tell me what that principle is.

[dzr0001]

I suspect that there's some marketing component at play here. People who do not own but observe devices making seemingly unnecessary noises might perceive these devices as premium. Think about the various beeps that occur when locking a car and arming the alarm, the startup sound that infotainment systems in some EVs play, the twinkle twinkle little star of a fancy rice cooker.