You’re right that’s definitely a difference, All your library modules don’t need server processing. To be fair I do see that on the server you are transpiling your JSX for the app into raw JS, so I don’t think it’s unfair to do the same with a CSS pre-processor. Both provide clear benefits to the author, and don’t usually cause debugging problems in the hands of a skilled user.
I feel like we’re definitely on the same page of looking for ways to increase development time, and decrease configuration time. I know if I wanted to do lots of configuration, I’d have gone into Jenkins and all the associated automated deployment tools, but bleh. Give me static files and an FTP client and I’m happy.