The other thing is that although a failure may be unique overall, there are undoubtedly common aspects among failures. So I feel like you can sift through a lot of failures relatively quickly once you find some of the common patterns.
For example, one of the most common failures of startups is no market for the product. Therefore, if you're researching a failed company and it seems like this is the case you can assume there will be little value in this failure and skip ahead.
Another possible technique following this line of thinking is to apply filters. If they failed before they reached x point, you can skip ahead.
He was a brilliant innovator that added value to the world. He was a failed entrepreneur that did not recapture part of the value he created. That makes him a huge success in my books but I wish he was more comfortable and content in his final years.
I think the better way to look at it would be to look at ways that it could've been done better. Everyone's a genius and mastermind that knows exactly why a certain product fails ("if they only had know this") or that the "bubble was there all along". Learning what could've been done better is much better than success stories where people knew what to do from some divine inspiration.
In short: it could help with removing (some of) the survivorship bias.
Maybe adjacent failures are worth study - studies of people who very nearly succeeded compared to someone who did, where subtle differences ended up being significant. These kinds of things can create "what to watch out for" kinds of guides.
In addition - what is failure? Was Nikola Tesla a failure? He died broke... but he still invented AC generators...