Your whole comment history with regards to PHP reads like someone frustrated that the tool they've chosen to shit on is exactly the opposite of what they think it is but they don't want to admit it.

There is concurrency..

There is Unicode support

There is a proposal for generics https://wiki.php.net/rfc/generics

For me personally its not a deal-breaker, there are workarounds if needed.

but for your question, why not?

It's so frustrating to see people just suggesting the "Mainstream" without considering if OP even asked.

Edit : Unicode support is not native. So concede this one, but again not a deal breaker as a language IMO.

To be fair, there is technically concurrency. But it’s not what you would really expect. But as someone pointed out to me 14 years ago, if you need concurrency in your web request you‘re probably doing something wrong.

There is some very impressive work going on to define how Generics will work in PHP. It’s a matter of when not if Generics come to PHP. I‘m expecting a new RFC for Generics to be created some point next year.