Moreover, I absolutely expect to have to update my prompts if I have to support a different model, even if its a different model by the same provider. For example, there is a difference in the behavior of gpt4-turbo vs gpt4-o even though both are by OpenAI.
Specific LLMs have specific tendencies and preferences which one has to work with. What I'm saying is that the framework will help, but it's not as simple as switching the model class.