Your choice to continue using them where they're effective isn't the issue; that makes total sense, obviously. :P
Yes, I understand that, as the game [i]currently[/i] stands, I'm FORCED to move on to new gear for endgame activities. What I'm saying is that you're not giving a reason why I should [i]have to[/i]- I.e., why my old gear is capped at 170 to begin with!
If gear is balanced enough for PvP in every other scenario, why not Trials and IB?
And, given that PvE is [i]cooperative[/i], and unneffected by the negative aspects of "OP" gear in the first place, there is ZERO reason to limit gear choices for the sake of "balance" in Story-based endgame, either. ESPECIALLY considering that 2.0 nerfed the crap out of most of the OP PvE-oriented gear (like Ghorn).
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It's because year 1 weapons trump the new with perks and the way they handle. If the allowed them to level up in year 2, it would be HoW all over again. No one would use any new guns and keep sticking with the old. My guess is Bungie thought it would be easier just capping them at year instead of trying to balance them, cause they wouldn't be balanced if brought to year 2.