What you really own now is a technology sector fund, which is far more volatile and risky than the large-cap growth fund you originally wanted. Funds switch missions. A fund may have been a value fund when you bought it. But growth-stock investing is very hot today. With no formal announcement, your value fund has become a growth fund.
Managers come and go.
You bought the fund because you heard great things about the manager. Then the manager joined a rival fund and your money is in the hands of someone you know absolutely nothing about. If you sell shares to invest elsewhere, you will face taxes. Fund holdings overlap. You buy an assortment of funds to provide you with diversification.