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why do I need an emergency fund if I already have investments?
You're absolutely correct. If you have maxed out your retirement investment vehicles and have some additional investments in a regular taxable account, you can certainly use that as an emergency source of funds without much downside. (You can borrow from many retirement account but there are downsides.) Sure, you risk selling at a loss when/if you need the money, but I'd rather take the risk and take advantage of the investment growth that I would miss if I kept my emergency fund in cash or money market. And you can choose how much risk you're willing to take on when you invest the money.