It's a time-commitment thing. We still have to get in the robot, set up a patsy to do our political shilling, hunt down monsters to kill for [A Hunger, Sated], and not end up so exhausted our non-Tribulation Apocryphal doesn't feed us to a Kaiju while we're half-asleep. We could probably make time for learning the Seven Seals if we were willing to feeding it with Hunger. But then its cost multiplies as its stronger effects and synergies are barred behind further Arete expenditures.
It's a good magic system, but it's also explicitly competing with every other thing that we could do with our time. When our Tyrannical quality makes contact with advanced civilization's Total Weenie attribute it's going to be super distracting. Monster Hunting will be a problem until we can scrape together enough tin foil and chewing gum to craft the Pillars of Creation. And what if there's a time limit on how long we can go without communing with Verschlengorge? None of these are guaranteed to become an issue, but any of them could. That's the pressure you're working against here.
