Continuing the discussion from Tier 99 medal
As we all know, there’s an ongoing Weapon Balance Program. Its purpose is to make weapons equally useful while keeping their (or giving them new) unique traits. So they’d work better on different waves.
In my opinion, having a tier requirement for balanced weapons would be a bad thing. There’s literally no reason for it to exist if all weapons are just fine.
I assume IA added them in the beginning because weapons weren’t equally strong, but I’m not the biggest supporter of that. It makes earlier weapons useless.
[Ideas are in the replies below]