Depends on work. If you need lots of bespoke styles then you quickly realize Tailwind only is wrong approach.
For sure there is huge trap in webapp developers who mostly copy paste HTML partials from Tailwind UI who succumb to Tailwind marketing and completely forget CSS.
Developers mostly don't like CSS so not many care. That's why there are so many solutions how to avoid it.
But utility classes (and tailwind as most popular utility classes generator) are super useful even if you are not just copy paste UI guy.
People use tailwind along CSS. You can write CSS components (written in css) and use them in tailwind and with tailwind.
I am heavy tailwind user and when i see this it seems to me like people forgot css exists.