Absolutely. You wouldn't know how/when to back test, you wouldn't know how to reduce turnover in your portfolio, you wouldn't know how to measure the volatility

Absolutely. You wouldn't know how/when to back test, you wouldn't know how to reduce turnover in your portfolio, you wouldn't know how to measure the volatility of your portfolio, you wouldn't understand why you were making or losing money, you wouldn't realize a regime change in the market, you wouldn't be able to efficiently allocate trades to reduce slippage, you wouldn't know how to optimize your portfolio to achieve a better Sharpe ratio, etc etc etc. The list goes on and on and on. I worked as a quant, and the finance knowledge you need is very deep.