Your job when doing an interview-format show is to get quality interviews that listeners will find valuable.
A pre-interview can help you achieve this.
If a guest isn’t going to give you what you need to get a great interview, you have a choice to make:
You can take the punt and do the interview without what you need – the pre-interview, a quality mic, the book the guest wants to promote, or whatever else the guest isn’t willing or able to provide.
You can cancel the interview and schedule somebody else who is willing to get you what you need.
A guest benefits from a pre-interview as much as you do. But guests don’t always see this, since many have a “churn and burn” approach to podcast guesting, focusing only on themselves and completely disregarding the people whom they’re speaking to.
Don’t participate in their disrespect for your audience. If you do, you’re going to be the one who suffers.
Get the pre-interview and anything else you need to get a great episode.
You're the host. You determine what's necessary for someone to be interviewed on your podcast.