For the most part Forbidden Scrollery kind of works around Motoori instead of with her - especially in the later half, which while stronger definitely shoves Motoori really hard out of the spotlight.
Honestly speaking Forbidden Scrollery is really weak as a series even past volume 1, as is mostly just cameos/cute art/hype moments/world building. That's not to say I dislike it - in fact, I regard it highly, with context, but as its own independent entity it's extremely weak, even once it gets rolling. I wouldn't be surprised if later volumes review just as poorly. But as its own plot - it's basically a series of pointless build ups towards payoffs that never, and cannot (due to how the series is set up), happen.
Wild and Horned Hermit gets a little bit more leniency in this regard in my eyes since it does explore Kasen's character and give us a few surprise moments here and there, even if the pacing is still extremely awful. There's at least an attempt at a story (Kasen herself, namely) being told there, and Kasen's almost always at least involved. Forbidden Scrollery, on the other hand, seems even more obsessed with cameos and exploring world building than with trying to explore Motoori's story or even trying to involve her as time goes on, to the point where the conclusion to her personal story is very right field and anti-climactic. Again, I must stress this doesn't make it bad as a work with context, but without that context and on its own merits Forbidden Scrollery is very, very weak, even in later volumes.