Personally, I'm a huge fan of using pure SASS I find it easier to read and write but for larger teams, not using SASS could be part of trimming the on-boarding fat of new hires for some. When I was talking with Gumroad about joining the team, they were using LESS. I asked why and the reason was mostly related to that. It's very easy to move between CSS, LESS, and SCSS but pure SASS does take a moment to get used to.
Personally, I'm a huge fan of using pure SASS I find it easier to read and write but for larger teams, not using SASS could be part of trimming the on-boarding fat of new hires for some. When I was talking with Gumroad about joining the team, they were using LESS. I asked why and the reason was mostly related to that. It's very easy to move between CSS, LESS, and SCSS but pure SASS does take a moment to get used to.