True but to your point those are mmos which destiny is not. The time between expansions for games like wow is a few years destiny has seen 2 in its first year with third marking year two. The rinse and repeat cycle for grinding for new gear is so much smaller that it renders aquiring new gear somewhat useless. Couple that with constant weapon nerfs/buffs and guns that weren't worth getting one expansion may be relevant in the next with limited vault space and no way to get old gear back players miss out.