Let's look at a mentioned example:
> Increase consistency around things that don’t matter. For example, Standard requires all string literals be double-quoted. Single-quotes don’t support interpolation but aren’t any more performant, so mixing single & double quoted strings adds a bit of cognitive overhead with zero discernible benefit.
But there are discernable benefits. Single-quotes are great for indicating "there is no interpolation here" and for strings that embed double-quotes.
Rubocop is great, though, and highly recommended if you do Ruby things.