For example, several of the next.js examples[1] use tailwind without explicitly stating so, because I guess it's just become a ubiquitous as css stylesheets or modules for some people. The problem I find is that it adds opinion and mental overhead for people learning related technologies or trying to get a head start without an opinionated styling solution. In order to use something like the blog-starter example for next.js I have to go and learn tailwind and then come back before I can use their blog starter, where as CSS is universal. CSS works with every project, without depending on Tailwind.
Anyway, looking forward to seeing newer improvements to Tailwind, but I hope that people will consider it an alternative to something like Bootstrap instead of an alternative to CSS.
[1] https://github.com/vercel/next.js/tree/canary/examples/blog-...