You may need some strategy only if you plan for active trading or day trading. But, you must consider that 95% of active traders are losing money and at the same time, long term holders are easily making 10x profits on every 4 years of holding.
What you are saying is most common suggestion in this forum but still many people are looking for only active trading rather than going by simply easy way of moneymaking. I guess most people are looking for exiting way of moneymaking rather than the lazy way of moneymaking.
But, personally I will prefer long-term holding because I always looking for a sure shot way of profit making rather than risking in something which is profitable only for less than 10% of people.