MVPs used to look like the rest of the web. Now people expect a “design” in a product. The web looks much different than it did even 10 years ago, but browser defaults haven’t changed much in 30 years.
Similar to how the quality tools rarely look as snazzy as the wanna-be's, and are sold to a more professional audience at a higher price but lower volume. They also typically need much less advertising and marketing, they are sold by reputation and word of mouth.