I dunno, but I feel some people are overly perfectionist of what to expect of a mass-produced piece of electronics. Like the "hiss defect" for example. Yeah, if I put my watch riiiiiiiiight up to my ear, and its display is on, and its a really quiet room with just about no background noise from ventilation, outside traffic, other people, pets, neighbors etc, maybe I can hear an electronic type buzzing, really super faintly. MAYBE, or perhaps I'm imagining it I'm not even entirely sure. If it is real, I'm like, COME ON, I hope nobody's ever returned their watch over that because it would be RIDICULOUS.
It's so incredibly incredibly faint. You CAN'T hear it unde anything even approaching normal circumstances. Even holding the watch at nose-length distance it's inaudible. Gotta be just about right up inside the ear itself.