Sorry, this is a ridiculous claim. This spec has been worked on for years in the CSSWG with participation from multiple browser implementers, Igalia, and other

Sorry, this is a ridiculous claim. This spec has been worked on for years in the CSSWG with participation from multiple browser implementers, Igalia, and other community members. Custom functions have been a huge web developer request for a long, long time and is one of the remaining gaps between standard CSS and Sass/LESS, after variables and nesting shipped. Mixins are next, and they'll be good too. Not every advancement in the web platform needs to be some kind of conspiracy.