We had that once during february 2020. It brought many of previous PvP-only changes to WvW. Right now, a lot of specs are overperforming in WvW due to certain traits, which are nerfed in PvP for a reason, that are left unchanged in WvW. Adding certain gear types on top of those builds creates some very powerful builds. However, in my opinion, Anet should balance those traits first before removing/changing any gear types. The latter would just cause a shift to other powerful builds and barely solve anything.