Yeah but the person who started this 'myth' must have experienced this problem all by himself without hearing about it, then believing everyone has this too in their dreams, he shared it as a way to determine your dreaming.

Look at flying, no-one goes around saying that you can't fly in your dreams but still some people have trouble doing it (including myself althouth that was in non-LDs). Same thing applies to light switches and electronics it depends on the individual.

But I do agree that reading that light switches don't work can actually cause the problem because you assume so but not that its a 'myth' altogether simply cos you don't have trouble with it.

I'm a wee bit stoned so sorry if I'm not making much sense hehe