I am fan of Source team, your projects and own many products by Source. When I saw Pho-devstack. I was too much inspired by it. I think Pho-devstack is doing more than others like Fast-shell and Fire-shell etc.
When I started using Pho-devstack, I faced many problems like Sass, are not being compiled , sometimes only main sass file is being compiled. Other sass files are not be processed and copied to dist directory etc. At times I noticed , Gulp is acting strange and not reflecting the latest changes, or showing the changes that I did 3 or 4 steps behind, where I had removed a style-sheet file but gulp is currently showing and using the old file.
Eventually I started using css , but I wish I could use Sass with Pho-devstack. May be it is me who do not understand all the things.