Anyone have counter examples to this? Companies that seemingly won the market without clearly defining a narrow wedge?
The article you linked listed a few companies which won markets without a wedge. Their list was Zoom, Slack, Workday, Notion, Datadog, Spotify, and Peloton; on first glance, this list seems to make sense.
This is just the old 'choose your beachhead' analogy redressed to fit the abundant availability of wedge gifs.