It does not. If you want to use Sass files w/ Bud, you’ll need to install the extension: https://www.npmjs.com/package/@roots/bud-sass There are also some posts in this forum about doing that.
I built a site a few month back using v10 alpha which had full TailwindCSS support and now using latest Sage version and ran into same issue with missing import files and no scss files. Can you share any progression with your setup? I have installed both @roots/bud-tailwindcss @roots/bud-postcss.
I actually am not implementing SASS, so don’t have anything to report on there, but in terms of the imports–as noted above–you have to be sure that any Tailwind directives you utilize are included in the file system referenced in module.exports = { content: [...here.
I did see a post here recently suggesting that Sage isn’t designed that it would be updated within themes based on it, which would suggest that the site/theme you build with v10 alpha, you would just keep at that codebase.
I can’t speak with any authority on that, though. I’m not sure how to handle, in the long term, sites I’m still supporting that were built on top of Sage 9 with Gulp and Bower. At the moment, its Node Version Manager and living with security warnings and a large collection of global libraries on my drive.