Some people are generous enough to share their recipes. That's great.
Others will not share an exact recipe, but are generous enough to share the key ingredients that work best for them. That is fine too.
If a person doesn't want to share a recipe or key ingredients, then don't. I think that is every person's privilege. My "Midwestern Nice" manners and my experience as a teacher, however, tell me it is kinder and better to keep that fact to oneself.