The description is quite detailled.
The Stand Bag "sits on the tee", Period. The only function is to spoil the view on the tees.
Stand Bag Plus "looks good" - disputable, and "saves four club sets", Period.
This may be a good thing to ease different club set-ups. It has a hidden function to make it difficult to sell clubs - you have to follow a procedure which is not described in Pro Shop or FAQ.
The limitation to 14 clubs has been part of the Rules of Golf for more than 80 years now (1938/39). Before, some players used to have a set of hickories PLUS a set of steel shafted clubs in their bags. Poor caddies!