alt Hacker NewsTailwind just happens to be a common way to write CSS.
If Tailwind didn't exist people would just be writing the same article about {{ insert most common css tool here }}
Most people create generic similar looking websites, and most people that making a new website today use Tailwind. Correlation is not causation, and linking the two in any meaningful way is just a pointless discussion.
Tailwind is just the latest iteration of people trying "real" CSS, discovering that it still sucks, and coming up with something with better abstractions than the last iteration of attempts to replace CSS.
Everything else is just people using a default configuration instead of building their own.