In WHA, magic is practiced the same way as art; a skill that you train by putting pen to paper. Unlike other fantasy shows, i feel like WHA grounds the mystry of a magic system by constructing it as a form of craftsmenship instead of some magical source to be tamed.
1) The line drawn between "witches" and "outsiders"
I think the use of "outsiders" specifically highlights the knowledge witches hold compared to regular people. It seperates how the two societies view the world and create a huge gap for misunderstandings.
Ngl, when i first read the manga, i really empathized with Agott. Although i know people criticize her for being harsh towards coco for the first few volumes, but i think thats the most relateble part.
Coco, being an outsider going into the world of witches with no experience of spell casting is an out right humiliation of Agott's years of practice and the hard work she paid to be accepted into the atelier. Since Coco still does not understand the complications of being a witch and the responsibilities that comes with it, making Agott distance her even more.
For me, these interactions remind me of when people who don't draw comments on my art. Or over-simplify art movements due to their lack of knowledge. And i do sometimes feel a deep sense of irritation because non-artists will probably never understand what it takes to be here and how arrogant they unintentionally sound.
And it's simply because of unintention, that it creates a mental gap between our world views.
2) Art is everywhere for thoes with the eyes to see