They... have always expressed plans on raising the level cap in this game every 1-2 years. And that relic weapons would be upgradeable as the game went on. It's how they were designed. They won't always be equal to the best gear in the game, though. In the future they will likely be behind weapons awarded in the most "current" content but kept competitive through upgrades.

Right now, Relic+1 and Allagan are the best weapons in the game, both are based at lv50.

Both are relatively easy to obtain, mostly taking time to farm.
What the hell?