> I think framing this is a checking account is what people are having trouble with. It really seems like an investment account with easy liquidity. If you add a section that is kept in cash, then it's checking + investment with automatic rebalancing.

This is absolutely the case. This isn't a checking account. This is liquidity management for those who are comfortably operating aggressively with their personal finances. With that said, definitely going to give it a spin side by side with my Fidelity Cash Management account.