Deriving authority for this statement form Eric Meyer is misleading. Eric didn't say don't use outline: none, he said make sure you have focus styles.
Browser defaults are ugly and inconsistent. Ordering designers everywhere to not override that is like telling Picasso to paint realistically because some people find his work inaccessible.
Asking designers nicely to make sure they have elegant focus styles is both appealing to their ability and sensibility without insulting their creativity.
These defaults are extremely consistent within the same browser, and wast majority of normal people tend to use on browser for the most of their browsing.
Browser defaults are ugly and inconsistent. Ordering designers everywhere to not override that is like telling Picasso to paint realistically because some people find his work inaccessible.
Asking designers nicely to make sure they have elegant focus styles is both appealing to their ability and sensibility without insulting their creativity.