You're right but the parent's point is that multithreaded code with shared objects is known to be particularly difficult to do perfectly, and hard work to debug

You're right but the parent's point is that multithreaded code with shared objects is known to be particularly difficult to do perfectly, and hard work to debug. It's so difficult that the rational strategy may be to architect to avoid it. We will have bugs, but not those bugs. Those bugs stink.