Yeha, you lose some of the Elin romance with no mage, but you still get romance, the lewds don't decrease, like Lia does on bookworm. Like what is the reason we can't get the dinner scene wirh her before marriage sex, or chronicles one where its talking about paintings, and such. Those feel like they shouldn't be class locked.
As for coup, stopped playing, actually fast forward through some, cause was tired of getting shafted on Lia scenes, but actually you don't get Queen or Elin scenes if you do any part of coup. You lose two. Lia actually gets one that isn't path locked regardless of coup, amazing concept.
If you go through part of coup, the only thing added is some extra cass scenes, losing a queen and elin scene. Felt like a decent trade off and story branch, unless somethings are missed later, that I don't know about.
And the Lia thing feels like a pretty big crack to me that is putting a major damper on this game. Like still don't know why those two scenes previously mentioned are path locked, like literally for dinner Lia scene, all that wa mentioned from quick glance was the party scene, dance, non path locked scene.