Yes, but in terms of your marketability--even in a world with LLMs--it seems to me that learning React or whatever is popular and trendy is quite vital. You can't propose good architectures in /plan or review slop PRs in React without knowing React to a level of depth that could only come from having toyed with it, and thought in code.
It is still an open question though exactly how big the need will be to propose good architecture or review slop. I petsonally think it will still be important, but it will vary by application for sure.