I280 weapons were a mistake

[Vaer]

To be fair this is somewhat new territory, they have never completely invalidated raid gear/cap ilvl until a new raid tier or expansion is released. They've followed a very rigid progression system since 2.0 so this is kind of new even though it's just the weapon slot. (Maybe they are planning to take a hatchet to everyone's 270 gear too?) Everyone that has played for a while knows they replace gear eventually, just the timing of this one is odd and not normal going by past systems.

Yeah it's rare and layers of RNG, but I wouldn't give SE the idea they get a free pass because it has a low drop rate. Eureka might end up full of lockbox RNG progression systems.