Wizard spells are written in an obscure language they spend a long time learning, it's not english as we can hear when spells are cast. Hearing Lae'zel cast spells like Gale or Shadowheart just feels off. The difficulty and mystery surrounding Arcane spellcasting is what makes it cool and interesting in the setting. If any farmer can cast Fireballs from scrolls magic becomes mundane.
I agree about the spell scrolls - and my expectation is that this is just not been implemented yet rather than they are planning to just let everybody use scrolls.
Following on what you were saying - I understand the scrolls themselves are written in Draconic, Celestial, Netherese and Demonic - its not just a recipe written in common like making chicken soup. If you don't pronounce that shit right you may catch fire, explode, or be polymorphed into a slug - like rolling on the Wild Magic table but only negative outcomes.
