All the stuff you're complaining about is stuff that isn't really a python problem. They are definitely valid complaints, but they are with nonstandard things. Numpy is not really Python, it's magic on top of Python. Same goes for OpenCV, which is really just a bridge over to native stuff.

Python is very popular for the use cases you describe, but I have long felt it's akin to using a Honda Civic that has been souped up to be a specialized race car. You can definitely make a Honda fast around a racetrack, but that's not what they were designed to do. You're better off using a purpose built machine.

That being said, a purpose built racecar is harder to drive, doesn't have AC, needs more maintenance, has more expensive tires that wear out faster, etc...

Nothing in life is free, there is always a trade off.