Yes.
This concept of small manufacturers that excel in their niche has been the oldest business model in history.
Especially in Japan and Germany many companies have existed for over a millenium like that, and even today half of the made profits are by small, (50 people or less) companies that are hidden champions.
You probably never heard of http://www.walterwerk.com/en/, but they’re the world’s leader in machines that produce ice cream cones.
As you said, it’s not just since computers that these companies existed – they’ve existed for centuries.
But what is different this time is that for the first time investors are trying to invest in these small businesses, and try to make a huge profit out of them.