Every Borderlands drop is a completely random concoction of stats and perks. There are no set weapons, no set ways to get them, and you get new gear at a near-constant rate. The whole point is that you're always supposed to be finding crazy new loot, with literally [i]millions[/i] of options. Not a great comparison. And yes, old gear should stay, as should every new piece of gear that ever gets added. It seems like a massive waste of time and money to create 5-6 weapons foundries that will [i]also go extinct in a year.[/i] That's not how DLC works, in my book. :P