Progress. You don't see people using horse carriages as a viable means of transportation anymore, now we use cars and planes and other vehicles. It is all about the forward movement. The Gjallarhorn and other exotics are great, of course, and they'll stay in my vault, but for the sake of creating newer and better weapons, I will put them aside. It's gonna be fun using these new guns as well. Plus, if it bothers me that much over losing some time spent in a video game, I'd probably take a break from it and work on how I perceive importance of things.