Trying to see if I'm not missing something here, but it seems that if site routes were children of the main "site" route, the site theme style would be automatically applied to Scripto pages, and we wouldn't need to copy a CSS file inside Scripto module folder.
(for reference, I'm talking about this: https://omeka.org/s/docs/user-manual/modules/scripto/themeingScripto/)
And because of that, we also cannot have some site features (like the site navigation or the ability for themes to override view templates)
I see that these pages use their own layout for navigation and that may be challenging to do in a theme-agnostic way, but aside from that, is there other reasons to keep it this way ?