Maybe?

In some cases, definitely. Then good luck making the business case to improve the framework or swap and refactor around a different framework. (Or you can do what I do during the more motivated/less busy times in my life: find undisturbed unpaid time to do it for your team.)

In other cases improving the framework comes at the cost of some magic that may obscure the intent of the code.

The nice thing about LLM code is that it's code. You're not monkey patching a method. You're not subtly changing the behavior of a built-in. You're not adding a build step (though one can argue that LLM generated code is akin to a separate build step.) You're just checking in code. Other contributors can just read the code.