Using investment account as a bank / lending account

I have an investment account with IBKR with around 500k in various stocks in it. Do they support using it as a bank account ? I have a routing number and account number , just curious if I can use this as my primary bank account for

1. Receiving direct deposits
2. Paying my mortgage
3. Paying credit card bills etc.

They seem to have very low interest rates. So have been wondering why I deposit to my traditional bank account at all. And even if there is some overdraft / borrowing on margin, the interest rate seems to be very low (1.6 % ?)

Am I thinking about this entirely wrong ? Or does IBKR not support this ?

#investment #banking

500k - 10y