Author of Telefunc here. I'm glad folks are finally taking RPC seriously.
RPC is back. Smarter, leaner, and stronger. (Sorry for the marketing jargon, but I really do believe that.)
Telefunc is still fairly young, you can expect a lot of polishing in the coming weeks/months. The high-level design is solid and I expect no breaking change on that end.
If you encounter any bug (or DX paper cut), please create a GitHub Issue and I'll fix it. I'm also the author of https://vite-plugin-ssr.com which also has no known bug, so I do take that claim seriously.
Let me know if you have any questions!