Quote from HARDMAN_GAZ:
It's no good just looking at PA without having a little bit of knowledge of what's causing it.
In response to the thread's question, you can trade by anything alone as long as you do your research, create a profitable trading plan based on that research, then follow the plan.
In response to GAZ, if you trade pure price action, how do you go about finding out what's causing buyers to overwhelm sellers or vice versa? Even if you could find out what's causing more institutional traders to buy than sell (or sell than buy), by the time you got that information, the trending move may be weakening and a reversal may be setting up.
The movement of price in real time is telling you everything you need to know about the imbalance between buyers and sellers in your trading time frame and you can capitalize on it by joining a demonstration of new (trend reversal), renewed (trend continuation from a pullback), or continuing (trend continuation out of consolidation) strength/weakness.
News data can be a hindrance. If an early morning economic news release misses the estimate and the market breaks out of the upper end of a range on the news and runs hard, what do you do?
Do you fade the move up and even average down against a continuing trend because you assume "they" are causing a short squeeze so "they" can then sell into strength?
Do you trade the price action but only if it sets up to the short side because you're afraid to trade against the news? Do you just sit on your hands, then, if price continues to trend higher for the rest of the day?
Or do you trade the price action and look for long entries as long as the price behavior tells you the buyers remain in control, and once the price behavior throws some reversal signals, switch to the short side?
You have no idea
why buyers are overwhelming sellers on a "bad" news release, and trying to figure that out might keep you out of some profitable trades.