You have to remember, one of Destiny biggest gimmicks is falsely extending playtime by exactly what you are calling them out for. This is just another of many, many methods they use to artificially extend play time. They know how many people they lost after HoW when people blew threw everything in a week maybe 2 tops and they aren't going to let that happen again. This new method in their mind is a way to keep people hanging around and constantly thinking there is a new exotic right around the corner.