No concurrency is a missing feature, not an upside. OOP is a broken paradigme, so no upside to be found there either.
That's an opinion that isn't very popular or useful.
Ignoring the multithreaded PHP runtime and fork functionality, implementing every feature (whatever user X particularly wants) in every language will never happen.
Saying OOP is a broken paradigm is irrelevant. Some people prefer it and they are users just like you, but different too.