[xvf22]

Thankfully you were alert! The problem is it works really really well just enough to have people drop their guard a bit which leads to all sorts of bad outcomes. Who knows when a car firmware update kills someone by adding a twitch like this where previously there was none.

[matmatmatmat]

I don't know why you're getting downvoted, I think you make a really valid point: It appears to work well-enough for many people that they lower their guard, but not well-enough to actually work reliably, so it actually increases the overall risk profile.