Barely going to touch those language claims; I've written production systems in two of those, and Java, your preferred stack. They all can share memory efficiently between units of concurrency; this just seems like another example of you claiming your own limited knowledge as being truth.

In terms of building real world systems - oh, but I have. Over a decade of building distributed systems, across 5 different companies. In domains that cared about correctness. You have a data point; a weak one. "This worked for me". Which I'm not arguing against (well, I'm nuancing it a bit; it worked sufficiently well to not cause business issue, which is a different metric than system correctness, but somewhat immaterial).

What I'm arguing against is your claim that "This will work for everyone" and "everything else is too complicated".

Which you've been unable to refute. In fact, you've been unable to even provide evidence for your own position (beyond the aforementioned "it worked for me"), let alone the counter claim.