YC has only been investing in deep tech for about a decade, I'm not sure that's long enough for them to have had a home run yet.

For example, Boom Supersonic was founded 10 years ago, and just this summer completed their second test flight. They are scheduled to launch commercial operations in 2029.

Lucid bots was founded in 2018, and just did their Series A to fund their growth of their autonomous drone fleet.

I wouldn't count YC out of the deep tech game just yet.