Except they’re right? You don’t need an ilevel 345 weapon even to clear Savage, much less clear any content that’s not Savage. The only content that really called for it is Ultimate.
That being said, again, it’s about making sure the developers don’t completely invalidate a set of weapons. Release a Relic in the same patch as a new Savage tier, with the same ilvl as a Savage weapon, and the Savage weapons are immediately invalidated. Why get them when you can get a Relic instead?