I think of my checking account as a buffer - direct deposit goes in, bill pay goes out, any amount beyond this month’s bills goes to/from brokerage. My particular account has a minimum balance and the actual balance hovers right around there. Any interest lost/earned on that balance over a year isn’t enough to worry about, and no payee/payer ever sees the magic numbers to access my real savings.
The key is not to have cash just sitting around, regardless where. If you don’t have immediate need, get it into investments. Modern mutual funds or ETFs are liquid enough to serve as emergency fund - unless your ‘emergency fund’ is something you dip into every other month. While interest rates are so high, it may not feel pointless to keep cash, but even those high rates are only 1-2% above inflation (and have only risen above inflation recently). Get your money back into the economy; don’t pay a banker to do it for you.