domain expertise has nothing to do with llms. On the contrary, to have it you need to avoid llms.
>>you risk prompting Claude Fable 5 like it's GPT-4o
Thats fine because when GPT came out you had to treat it like a baby, GPT2 and around that time "Prompt engineering" was a thing.
Now its all dead.
After opus 4.8 all you have to do is say "fix it" or add /plan. All that time spend on learning previous models is time wasted.
And in a year or two with developed harness you will be out of the loop, errors are incoming - llm fixes them or adds new features based on some transcripts etc.
Even if model development stops now - there is nothing to learn really. Sure you may need to adjust prompt style a bit. You will do it naturally just like when you communicate with a new person. There is no "knowledge" to it, it is very smart.