Always strategies are seeming easier and profitable but in practical they are not. One usual problem with most indicators is time lagging; it means it will generates the signal only after the actual turning point. This is the reason the explanation of strategies or indicators are looking very much easier in books and complete different in markets.
Scalping requires to catch exact turning points of markets which must be too hard by any indicator or strategy. If you opt to catch small swings of markets then you may start losing bigger trends. Trading is all about profits which is too easier by catching bigger trends of markets because profiting the longer waves require less hassles compared to scalping.