As mentioned it all depends if the security is respecting it. :) If there's been no correlation between the 55MA and the security in the past, I'd ask why the future would be different.

For example I did analysis on BTC that showed it respecting the 150MA. I coulda thrown in the 140 or 160 and it would yield the same result because the averages are very similar.

That gets into the art of TA. Find the nugget for each security that has shown reliability and forget the rest of the indicators until they do as well. :)