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They got a bad reputation pretty early on, because the early models didn’t have any kind of obvious power indicator. You just had to trust that they were turned on when you went to use it. Plenty of people got shocked because the battery in their NCVT had died, and the user didn’t realize that it wasn’t working.
The issue is that there isn’t any way to make them fail safely. The word “failsafe” exists for a reason. What if the power light is on, but it has a cracked solder and isn’t actually working? On a multimeter, you’d be able to see that it is obviously busted/not giving good readings. But with a NCVT, the first “this thing is busted” indicator you get is usually when you touch a hot line that the NCVT failed to alert.