...maybe the question is an advantage if asked 'how' does an indicator fail......in the same way, how does a pattern fail, how do lines on a chart fail......indicators do not fail, patterns don't fail, lines don't fail.....comedians fail to tell good jokes and chartists fail to understand context of a signal from an indicator.....truth is, the mere study of an indicator, most often, causes a trader to fail in seeing the message in the active price......
the circumstance where an indicator fails is the circumstance where you are observing it.....kinda like the quantum jibba jabba of trading....observe and you shall fail.....
😉
....in the nicest possible way