> It's one of the slowest languages on the planet

It's fast enough for many use cases. That doesn't mean that there is no room for optimization, but this is far less a deciding factor these days.

> it's not type safe

You can do static analysis with Mypy and other tools.

> it has not real concurrency.

There's different mechanisms for running things concurrently in Python. And there's an active effort to remove the GIL. I also have to ask: What is "real" concurrency?

Admittedly, the things you mention are not Python's strongest points. But they are far from being dealbreakers.