Still you may decide not to hold cash, but rather near cash equivalents that at least give you some yield, like short term debt, easier in the form of a mutual fund.
I think it's a good idea to keep cash in an emergency fund.
Not necessarily bro, it's very fine to keep it in a financial system that doesn't experience much volatility, it would've been best in Bitcoin but the volatility is a great problem now.
For people with currencies that crashes against the dollar, they can keep them in stable coins like USDT to reduce the impact of inflation on it or you can even place it in the save option in a microfinance Bank app so it's there getting you little profits while you can break it anytime emergency comes.