I find that runescape has very little items, ending in everyone wearing the same stuff, or slightly different combinations of that stuff. So what jagex will just make a new weapon, because nothing can be perfect, every weapon needs some flaw or else everything would stop and everything would be about adding str/att/def bonuses to it (Im confusing myself in my wording). Godswords are the best they will ever be, and i don't think they should be upgraded because it would completely change the way they are seen. From being ko weapons or bossing to something different. Jagex can just make new stuff and make the game more diverse along the way.