MAs, like all distillations of market data are a measuring tool - like a ruler or a pressure gauge. They don't work or fail, they show what the formula spits out and that's it.
If you build a house and it collapses, it sure wasn't because your tape measure failed.
But what's more is, if you use them to project current trends, and you can statistically show that they work, then
"Good on ya!" and get on your way. And
if your statistics show that the future is not so-well aligned with those lampposts of the past, then don't use them. But forget the mystery, voodoo, or religion:
TEST. Then verify.
Modify. Then construct a feedback loop to check your re-test. It's just numbers.
They work, "they don't work/fail, they show what the formula spits out and that's it."
Oh, and for those adherents to so-called "Price Action" who eschew (
nasty,
troublesome) "technical indicators" -- YOU ARE USING INDICATORS.

You use one that is crafted to
show four different market prices in one slice of time -- it goes by the name "Japanese Candlestick" and has a long, glorious history.
And if you try working a market with an inappropriately-timed Japanese Candlestick? You will get raped.
Oh! Oh! And,
pay me $197.06, and I'll send you my super-distilled
Genius Wisdom JAPANESE CANDLESTICK decoder phrase (three words long



) which will unlock Japanese Candlesticks, AND "Price Action" for you, forever.



QUITE the bargain!!!