It's nothing like fatigue because they're not reducing the overall exp gain in the game.(as far as we know)

Also, why do people think GA is being replaced by logout bonus? IDK if it's just me but I thought log out bonus was a separate change considering that leves are getting an exp change to compensate for the lose of GA. Maybe it's just me? I just thought log out bonus was going to be a bonus for the casual gamers.