Your weapons are not your children. Your weapons are your tools and in a FPS game, you select the most effective tools from your arsenal for the task or role you are approaching. If more effective tools appear, you use those, if previously effective tools can no longer compete, you shelve them. The irony of this entire argument is that it is actual Role Players, as in the RPG element that many MMOs have that Destiny and other more FPS games do not have, these role players are the ones that form an attachment to a particular weapon. An FPS attachment to a weapon is a weird and out of place concept.