computer languages have a major problem. That is, backward compatibility. Basically all languages, are hit with decades of backward compatibility cruft. And, that seems to the the main problem of languages.
so, how to solve this?
it seems, one way, is to somehow magically automatically change all existing code. When old code run, it automatically generates new code, and that source code is run. Βut this doesn't seem to solve the problem. Because the lang still holds all the old cruft. It only reduces the problem, by making it trivial to update code.
perhaps another way, is to declare, that the language will forever be unstable. That, by using the language, you assume to continuously update your code. Google's web products, seems to be taking this approach. (even though it's not languages, per se. But lots of Google's API are like that, and comes and go.)