For clarity the discussion on multithreading was about it not being ready by June as previously believed. Github milestones changed some weeks prior with the removal of multithreaded testnet.

"Our original roadmap called for a single threaded implementation to be complete by June 2018 and for multi-threaded development to take place thereafter. We are excited to share that work on the parallel execution engine has begun 8 months ahead of schedule and we believe that it will be ready by June 2018."

https://steemit.com/eos/@dan/eos-io-developer-update-support-for-apple-s-secure-enclave-and-similar-technologies

Some felt it neccassary to defend the changes in favor of singlethreaded and other features.

Somebody was asking in the chat...