After using Schwab for both my banking and investments for more than a year now, I'm convinced that the most under-appreciated killer feature for a brokerage is actually cash management (i.e. a checking account you can pay bills from).

Managing both my banking and investments at Schwab allows me to keep $0 in my checking account, and make use of their overdraft transfer feature to debit my investment account whenever I make a purchase or bill payment from it. If there's insufficient cash in my investment account at the time of the debit, I have the option to cover the remaining amount with margin borrowing, which usually ends up costing cents in interest since I generally sell a few shares to cover for it in the same day (trades take 2 days to settle though, so some interest will still accrue). I feel that's a tiny price to pay for the ability to keep myself fully invested as much of the time as possible, and practically speaking, I rarely ever have to resort to margin borrowing anyways since I time my bills to match my direct deposits (which go directly into my investment account).

Essentially this means I only have 1 account to worry about to manage all my finances, and don't have to juggle money around between a checking account for spending and investment account for growth. This might not sound like it'd make much of a difference, but I honestly can't imagine ever going back to managing my finances the old fashioned way with multiple accounts. Needless to say, I can't see myself switching to a new brokerage that doesn't also offer cash management features of the same caliber (and AFAIK, Robinhood doesn't, but I'd love to be corrected).