Sorry if this has been answered or covered on the web I'm currently travelling.
Edit: I managed to read the linked page, thank you for working on such an amazing project!
But I can say that some form of global content discovery is in my personal definition of done for the project. I'm the BLAKE3 guy at n0, and I don't consider blobs done without global content discovery.
But it is a hard problem, and our standards for "it just works" are pretty high.
If my understanding is right, content discovery can't happen on the existing mainline DHT which is a shame. Maybe once you have enough traction you can propose a standards change? DHT mainline today is amazing because of its network size.
We would love this to gain more traction so we can use mainline also for content discovery. But we have to be realistic: mainline moves slowly, and for good reasons.