Yeah op is right, why play ttk when the next dlc or expansion or full game comes out, youll get new armor again to grind for.....wait, why play that one too? Youll have to grind for newer stuff for the expansion after that! And after that!
Oh wait, thats the point. Youre on the path to make your guardian as strong as possible. Im sorry its not so cut and dry to just kill something and everything you own levels up compared to finding items to upgrade certain things. Thinking about it, it doesnt make sense that a gun is more powerful because you killed that lonely dreg by the cliff but it makes more sense *in destiny land* that you infused some magical shard to it to make it powerful...but you dont seem to like that.