Yes and no—said user ran this as an experiment (relevant quote: "But with a filesystem this young, you inevitably have to accept some rough edges in return for some fun."), but eventually stopped it partially due to the people involved (relevant quotes: "But here's the main issue for me: Reporting bugs to bcachefs is not a pleasant experience."; "And at some point, the fun just stopped for me."), not just because there were bugs.

fun is not something i want to describe my fs as

If that's what you got from the article, I recommend you read it again.