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MACD doesn't even use SMAs.
Some indicators do allow you to specify the MA mode. Most MACDs are an average of the difference between 2 EMAs tho. Hence the lag. Depending on how the pair is behaving that can be a problem or not.
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Please don't fall into this trap where you start thinking that moving averages provide some kind of support and resistance. It's just simple math and they have no predictive powers.
The "draw enough random lines" theory. The human brain does tend to see things that aren't there. Still, there are a few MAs that have some value due to the number of traders using them. Mostly it's just a convenient way of filtering signals, for better or worse. I like the 200 EMA, it's usually a decent trend line for pairs that are trending.