[tartoran]

I think reading develops internal monologue and you also can change the tempo according to understanding, slow down when a pasaage is hard etc. With audiobooks something that is not very clear escapes away as the audiobook moves on. Maybe multiple listenings can fill the gap but am not sure if re-listening to audiobooks is a thing.

[Schlagbohrer]

Yes, well put, this happens to me too. I have to re-read tough or confusing passages, and I can slide quickly through simple parts. The forced pacing of an audiobook throws me off because of that.