I can't speak for others and imo they're relevant depending on strategy. For example, maybe I'm trading the trend using the 1 minute chart & within my plan I offer to the market, maybe a good place to offer is around the moving average in anticipation of another bounce higher. Could be looking to trade reversals and a break down of a trend into the opposite direction etc etc.
I don't know what others find useful or use on their charts, I'm mainly focused on volume & price action but on certain trades I like to see all 3 trending in the same direction.