Well, sort of. But all the things are different implementations.
Biggest reason? Last time I checked, interest on funds was 0.1% on brokerage checking, and 1.0% on Investor Checking account, and can go up much higher.
Right, but if the only reason for the checking account is for the increase in interest, why not use the brokerage account for all of the 'checking' benefits, and then open a savings account where in interest is 2%?