The upgrade feature makes sense. If you have been around and stuck with the relic questline from the beginning, it won't be nearly as big of a deal to get a completed relic @ level 75 relic cap (Theoretical) Because you've done them as you've released. However if you start in 2.0 and have to catch up to max level first, then do the entire base quest, then several upgrade quests of equal difficulty, I see them being pretty rare.