I would think that frameworks make more sense than ever with LLMs.

The benefits of frameworks were always having something well tested that you knew would do the job, and that after a bit of use you'd be familiar with, and the same still stands.

LLMs still aren't AGI, and they learn by example. The reason they are decent at writing React code is because they were trained on a lot of it, and they are going to be better at generating based on what they were trained on, than reinventing the wheel.

As the human-in-the-loop, having the LLM generate code for a framework you are familiar with (or at least other people are familiar with) also let's you step in and fix bugs if necessary.

If we get to a point, post-AGI, where we accept AGI writing fully custom code for everything (but why would it - if it has human-level intelligence, wouldn't it see the value in learning and using well-debugged and optimized frameworks?!), then we will have mostly lost control of the process.