I realized that it's not available.
My point was :
Please, MAKE it available !
Just put the .LESS or .SCSS files onto the /assets/ folder for example, so that we can use them, to compile our own .css versions that visually work with the templates we use for websites.
Zero programming needed !
It is HIGHLY unprofessional to not have that.
The precompiled .css almost always interferes horribly with the websit template's css, so we NEEEEED to be able to assemble the sppagebuilder.css ourselves !
That one very issue is the reason, i still cannot use SP Page Builder on as many sites as i'd like to !
Please, if you do not understand the scope of this extremely simple to solve issue, please just tell your superiors / the developers about this suggestion, and I very much guess, they will instantly agree.