Buy and hold is the default way to invest for wealth creation. Mutual funds love it. Distributors also love it, because they earn full fees so long as the investor is holding the fund.
To be fully invested for long periods of time requires investors to ride an emotional rollercoaster, which while exciting when you are making money, is a terrifying prospect when markets are falling. It’s no surprise then that a majority of investors fail to follow the buy and hold method. In trying to do so, they often end up earning lesser returns than the underlying fund itself