Heya ruffled feathers... So on Tools that make our lives a bit simpler: It is good to learn new things and add them to a portfolio of skills - especially if they are in demand. The more style sheets are added to a website, the more difficult it may become to manage. There are various tools (libraries) included with pre processors that may allow you to manage CSS files and track errors that occur at runtime because of incorrect selectors, etc (like GRUNT and GULP). Some environments include easy access to these tools. I agree that it may be better to try and learn and understand CSS without a preprocessor - mainly because the same rules will still apply (whether or not you use a preprocessor), and the parsing occurs when your project compiles... So a developer may not gain much input or insight by using a preprocessor, although this may just have been my experience with it?