Would you like a valid counter-argument so you don't have to resort to using the all too often wrongly used strawman defense?
Your example would be correct if we already were able to get leves at the aetheryte, but since we aren't, it is not a direct comparison. It takes time and as you so eliquently pointed out, time is a tool the devs use to preserve the lifespan of the game. And this is, after all, what we are talking about. Making it faster to do leves by getting them directly at the aetheryte.