[orionblastar]

Even if a Startup fails with an idea, another can learn from those failures and mistakes.

[latexr]

While that is true, OP grounded their question specifically in the context of YC telling founders to avoid tarpit ideas.

https://www.ycombinator.com/library/Ij-tarpit-ideas-what-are...

The title of that post is (emphasis mine) “what are tarpit ideas & how to avoid them”. OP’s point seems to simply be “YC has data on which ideas are tarpit ideas and tells you to avoid them, so why don’t they help you identify them?”