As shown, bags and metal woods are “optional” upgrades because that’s exactly what they are–optional. When you are forced to buy an entirely new set from all other brands, you have no choice but to replace everything whether it is needed not. Not with EPEC. If your young golfer is hitting their driver great, don’t change the head. Same for fairways and hybrids.
Bags are sized to fit a range of club sizes so there’s no clear cut time when you have to buy a new bag.