The version on the right has the same negative as templates in Django apps where they need to be namespaced in another directory so they don’t conflict.
e.g. sites/adamghill/templates/adamghill/base.html and sites/alldjango/templates/alldjango/base.html
Although, maybe I could solve for that since I know which site should be handling the current request. 🤔
I also don't know how to deal with the static site building with multiple sites. Maybe output just has sub-folders for each site?