That's exactly the problem. They keep making new weapons, but they are all junk compared to what we already have. What makes a weapon good is it's impact stat and it's perks. They obviously knew how to make good weapons when they made Vault of Glass. What happened since then? The reason everyone was so happy to ascend their old gear in House of Wolves was because the old gear was the only good gear. If they gave us new weapons that were better than the weapons we already have we would be glad to replace them. For instance, when I got my first Arc damage The Scholar (Adept) from the Lighthouse in Trials of Osiris I was happy as hell to replace my Fang of Ir Yut (partially because that weapon was so average).