It is good to read more articles about the gotchas with @extend. The use case for relationships in the comments is interesting too.
I do have two questions though, re ‘Extending is not necessarily better than mixins regarding performance’:
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We have come to learn that .unnecessary .levels .of .class .specificity can be detrimental to performance - do lists/combined selectors suffer the same? (By which I mean the .really, .long, .class, .groupings, . caused, .by @extend)
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What if you are not gzipping?