Who was defending Ableton's architecture? All I can see are seasoned audio developers (including my humble self) trying to tell you how sandboxing works, how it can't improve performance and how your observed performance improvement are likely caused by something else. So please stop claiming that sandboxing helps performance - it simply doesn't.

TBH, you don't seem to even try to understand our arguments. If a domain expert like Paul Davis tells you something, try to learn from him and not easily dismiss his arguments.