It's called market segmentation and is fundamental to most businesses. I say most businesses, because there are always cases of businesses that succeed because of dumb luck or just being in the right place at the right time.
The statement "Happy customers beat the crap out of any marketing team you could hire" is pretty ridiculous because it downplays the importance of great marketing, without which, most products will get ignored.
The statement "Happy customers beat the crap out of any marketing team you could hire" is pretty ridiculous because it downplays the importance of great marketing, without which, most products will get ignored.