Not sure what's optimistic about it. Those features are there. You don't need to wait for them because they were easy to implement from w/in the language itself. Same way you traditionally build libraries.
All those companies are moving their languages and libraries at an incredibly slow pace and will continue to do so (since their languages don't really give them any alternatives). Nothing pessimistic about that. They are large companies with little room for flexibility.
And, your statement that development happens best in open source software is optimistic and opinionated.