In the end, everyone is kind of just sharing their own experiences. You'll only know whether they work for you by trying it yourself.
But at the same time, even this doesn't really work.
The lucky gambler thinks lottery tickets are a good investment. That does not mean they are.
I've found very very limited value from these things, but they work alright in those rather constrained circumstances.
Perhaps you don't believe OpenAI and Anthropic when they say this, but it is a requirement upon which most enterprise contracts are predicated.
In the end, everyone is kind of just sharing their own experiences. You'll only know whether they work for you by trying it yourself.