A supplier in Metro Detroit calls on a Monday morning to say your account is on hold, right before a busy week. The bill was sitting in an email you never opened, and while you dig for it you notice you paid another vendor twice last month.
With accounts payable handled, every bill comes to one inbox, gets entered and checked against what you ordered, and lands in a pay queue on its due date. You get one short list each week, approve it from your phone and the payments go out.
Vendors start treating you like a priority account. Late fees disappear, duplicates get caught before they happen, and at year end the 1099s are nearly done because every vendor's W-9 was collected the day they were set up.