Having an imposed limit is a tough pill to swallow for sure. "How can I speedrun this!?" The thing about the Zodiac weapons is that it wasn't meant to be acquired in 2 weeks, let alone 1.

Since obsession tends to win out over common sense most of the time, putting atma books behind a weekly timer is the only way I could see this from stopping burnout among players. And, really, SE would love to keep burnout. Keeps the game populated, you see.

Players don't want to burn out either. Not hard to see why.