I doubt that treasure items and ammo showing up in loot affects weapons and clothing in that loot. I know many swear by it but I see no actual evidence for it and suspect it is an old wives tail. I do believe that treasure items, and cards, are much more common in tlopo than they were in potco and so would not be opposed to making them more rare, like they were in potco, but I'm very against doing away with them or making them not drop when your collection is complete. They are a fun part of the game that I enjoy very much.