The perfect foresight angle is a paradox. If you can see the exact future before it happens just like you saw it, then you can't change the future. You can't even change your actions, it's all predetermined.

If you can shape the future through your actions and still watch the possible futures fluctuate/change accordingly, then you rather shouldn't choose an action that will first of all cripple your ability to do anything, and reducing your power and influence for thousands of years. I mean, you could, but as a prime angle ruling over a perfect heavenly Throne, what would motivate him to turn his world over to people who would ruin it? The promise of a new al-yisun, yeah maybe, but that would mean our fledgling heroine will soon enough turn into a transcended goddess.

Granted, I think Metatron has great wisdom, and he's got the intel to pull many strings via the thornies and 2Michael, but I guess his plan(s) are fallible and not based on his own prophecies and visions.