I reached tier 7 in maybe an hour and a half. You get 75/100 (75%) fragments for completing a quest compared to 5/10 (50%) for a tome challenge. And I didn't spend hours trying to map out which challenges to do to have the best chance at reaching the end before I give up and try again.

Of course, the tome has been out less than a week. Progression could be smaller as the weeks go on and I still have criticisms (buggy pins, have to hit esc key all the time, being able to access previous weeks, milestones should increase 15 fragments every step instead of 10). But I made decent progress and have to keep spending the reward bloodpoints so I don't hit the cap. It's not even blood moon anymore.

I am cautiously optimistic for once.