However, basic moving averages like the SMA, EMA, or WMA don't repaint.
Maybe repaint is not the correct word but I couldn't find a better one to describe the situation.
The problem with EMA is that it heavily depends on the most recent price level. So if the market makes a sudden move, the EMA will quickly update the chart.
That means that the price could touch a perceived support line (on the EMA chart) at, say 8:30 AM. So you buy.
But 5 minutes later the price changes again and the EMA is updated accordingly. But this time you discover that the price never really touched that nice support level you saw earlier, precisely because the EMA has been updated in the meantime.
This is only true when the candle is still not complete of course.
This problem does not exist with simple moving averages, as they are hard to move from one bar to the next.
