I think a lot of this stems from Trials. I was thinking about this last weekend when I came back to Destiny and started HoW.
Trials offers, more or less, some of the best gear in the game right now. Or at least, what is perceived as some of the best because it's so rare. I think a lot of people have attempted Trials only to realize there's content(weapons, armor, the lighthouse enviornment) that they paid for and are never going to see/get.
I never used the Thorn, TLW, or the Hawkmoon until I started playing Trials. That's all I use because I know it's the best chance I have to get to Mercury again(I've only been once so far)