Which is a great and smart way to improve PHP for the people who still have to work in PHP. But none of it is original to PHP, or provides a compelling reason to use PHP instead of the options where all these things originally were copied from.
Or would it be OK to recognize that most ecosystems adapt good ideas from each other?
And yeah, many different ecosystems adopt ideas from one another. And it's often a good thing, though it can be hard for people with a lot of experience in something to see new syntax/ideas sometimes. It's also sometimes hard for people to invert/twist their thinking in different ways. I see this a lot when OO devs try to work with FP concepts. Another example is getting used to Rust's pattern matching and enum values.
I/O is almost always the blocker.