I agree. But I feel like nowadays knowing CSS is not necessary to land a job in FED - while knowing frameworks as React/Next/Vue/whatever is.
This doesn't hold true for React, since they just decided to do their own thing, but for frameworks such as Svelte this is a core principle they try to stick to.
If you know the language you can use any framework in that language with minimal effort, and the bonuses of being able to troubleshoot underlying issues is invaluable.
Those are going to be on nearly every FE job description you see. I think OP's point is that they are not necessary to land a job despite their automatic inclusion in the job description.
(Speaking anecdotally, the companies I have worked for either don't have any CSS masters to sufficiently test for mastery or don't include those experts in the interviewing process. Or, more commonly, we are so desperate for framework devs that any amount of CSS knowledge is considered good enough.)