I think you should have a knowledge of both(fundamental and price action).
Having knowledge of both is not going to affect you in a bad way, it is only going to nourish your trading skills.
So, as per me, one should have a knowledge of both.
Yes, we shouldn't consider only the price movement because everyone should follow their developments and updates, sometime the price of a coin will easily pump with the release of their development and their progress will help the coin to increase their value.