There are several main reasons:

The success or failure of short-term trading depends on accurate prediction and analysis. It is difficult for people to make accurate analysis and always make mistakes, which is uncertain. If you can accurately predict the stock market, it is recommended to directly trade stocks, which is much stronger than funds.

Fund transaction costs are high.

The liquidity of fund transactions is low, unlike the funds sold on the same day.

Funds are not short-term speculative varieties and are not suitable for short-term investment. Of course, risk-free fund types, such as money funds, can enter and exit freely for a short time because there is no risk. At present, many fund investment methods can greatly reduce the handling fee, and some funds can be redeemed in real time, but short-term operation is still not recommended. Like stock trading, most short-term investors are losing money.