Why have the money taken out of my bank account for a purchase made today when I can pay it without penalty 60 days later and let the money grow in my brokerage

Why have the money taken out of my bank account for a purchase made today when I can pay it without penalty 60 days later and let the money grow in my brokerage account. Along with the usual answers like cash bank/points/consumer protection, it also decouples spending from "pay day".