Thanks for the thorough answers Ryosuke! Re: 5. This is giving me clear insight on why to use SASS. I've given it a half-hearted shot at learning but never felt a personal project of mine needed it. I forgot about mix-ins too, which could be fun. I do enjoy the facility of using minifiers and maybe that is the appeal of preprocessors/CSS libraries. I have also leaned towards using CSS for animations because I heard JS forces the browser to do more work, but never really animated anything that complicated anyway.
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