what would be interesting though, but much more of a niche, would be if some successful quant traders did an in-depth review of some "alpha" or strategy they ran some time ago, which is no longer profitable. They could discuss their tools, analysis , trading metrics, performance, and some discussion of why the strategy stopped working.

It would give a good window into the work-flow and skills required to do this successfully. Even if it's retrospective, going back a few years.