Every decade defines is own unique style and it spreads until it's no longer distinct.
3rd wave coffee shops all look like that because they started during peak farm to table aesthetic. It's funny because it was born out of the answer to 1990s strip-mall sameness where you'd find Chilis and Starbucks. I remember designers losing their shit when they found wood planks of fallen down barns they could use in their interiors.
Now that people are getting bored of farm to table, it'll be on to something else. When we look back in 50 years, all of this "sameness" the author is pointing towards will mostly just be here to define 2010-2020, with whatever name historians decide to call it.