Much like saying, "there's never a need for Scratch, it's just a way for my kids to code fun things without worrying about semicolons."
Tailwind is a design library for people who don't want to learn or write CSS. They don't technically need it.
It's ironic because standard software development practices advocate isolation.
Yours is a reasonable meaning assuming you meant the computing sense, but the more common understanding of the word would skew towards personal insult the way you used it.
Unfortunately people can't read your mind over the internet and unicode does not convey intent.
The cascade was a mostly mistake except for interesting applications like dark mode, imo. It does not scale easily for large orgs and its original usecases were tailored for balancing user/publisher/content creator presentation concerns. The market has spoken and the content creators rule.