half of the 1755 pages have how payments are made.....
Even if you did not catch up this week (late press the button or something else) u ll get paid next week so it's nothing so dramatic as some (18 to 20 year old) present......... 6,7 days difference.....
For Automatic payment i think people are used the FS system as it is, some of us keep earnings for many reasons (to extend account, to receive all money a specific date etc. etc.) so we prefer the manual system (default). If auto pay will many people get confused.....since most users are trained by the default system already.....and also there will be NO option for some to keep earnings inside if auto-pay enabled.
Maybe to draw a flow chart for describing it is a good idea.
Many people cannot read text form well, but they could easily understand visualized steps.