On the subject of locked threads. I also noticed there was a period when this happened frequently - but Evan did also post to explain what he was frustrated by:
I have not seen any locked threads since that time, and I also notice that more recently Evan seems to be able to join in here more often. It strikes me that the best way forward is to respect his wishes and not constantly challenge the design choices in the compiler and core. Much better if the core contributors can feel comfortable joining in on here.