We didn't make the guides better, we made the tradespeople make it so any novice can't burn down the house by not following a poorly written tutorial.
Slightly pedantic point of order: you mean to say every stud finder for sale these days, not in existence, for the old stud finders still exist.
Okay, that's all. Carry on.
That sucks, because that means anything built not to that standard (which I guess is a US one?) could lead the person to hurt themselves/the house.
One doesn't exclude the other, and most likely both are needed if you're aiming to actually eliminate the problem as well as you can.
Best to just say "most" or "some" to cover all corner cases :)