As others have said the relic weapon will keep on upgrading. That unweathered weapon will remain like that when 2.4 hits. Relic is supposed to be the weapon of your main class, unweathered one is supposed to go on you second or third class since barely anyone will bother repeating the quest.

The biggest advantage of relic apart from the fact that will never become obsolete is stat personalization. On my static there are 2 warriors, the other guy has a soldiery weapon with tons of acc and he's sitting on 580 acc which is an overkill and waste of stats. Relic will get respec soon which will make it even better.