It’s important to separate portfolio “case studies” from actual case study research.

Portfolio cases are for making things seem like you know what you’re doing to get attention and/or land a job. If failures don’t support the story, they are often hidden. Academic credibility or educational value is not a priority — and it shows.

Real case studies, on the other hand, are academic or semi-academic publications dealing with real-world settings and problems, testing different approaches to learn what works and what doesn’t, and attempting to explain why. The primary objective of such case studies is to develop the design industry with new insight. Failure is an integral part of research, and shared in detail.

For depth and reasoning, look into articles, research papers, dissertations, and thesis works labeled under case studies. Such case studies are published by universities or collabs, and are often featured in established journals.

I promise you that the process and methods used in them are not limited to the ones you mentioned.