Removing weapons from loot provided a greater advantage to people who were paying to play, since they could use purchased building licenses to build weapons chains. Anyone playing for free would have a struggle with building licenses, which means they would need to pony up and buy some gems, which is likely the bottom line reason weapons were removed. Free to play games usually have limits to how far you can go before you have to start paying, so maybe this is BB's way rather than a level restriction like some games do.

