I'm surprised you haven't mentioned anything about it in your HN comment, given it seems, at least on the face of it, extremely similar.
Are you able to go into a bit more detail about why Pynecone and not others?
Did you ever consider contributing to Streamlit instead or forking it? if so, why didn't that work out? What do you do better? Etc.
Disclaimer: I'm not too knowledgeable about this niche, however, so if I'm very off-base here then please let me know :)