I agree, nesting has been one of the most helpful parts in SASS to keep everything organised. Nestin is just harder to do right, you need some experience in organising files.

Even with the specifity I vastly prefer nesting to a bunch of files with flat selectors and a huge amount of globals where you need a lot of time just to understand which elements affect which.

The post is quite opinionated and puts every issue in a bucket, as if there is only one way to write CSS. A few examples would have been useful.

Not using Nesting is the worst offender in the list.