Hi @Prasant, I appreciate your response and the resource!
The reason I mention this (I already know how to integrate Sass into my development version of a theme) – what I am actually requesting is Sass in the PRO inspector, in areas within PRO that look like this (not just global css, but also the css for each element, bar, container, column, page etc):

I just feel that Sass in the inspector CSS would make the design process even faster than it already is with PRO, and make it even more attractive for front-end-designers to use PRO as their go-to theme for client work. This way, you don’t need to modify the theme itself to get started before you install, you just install PRO and go work on it on the front-end.