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To be serious about numpy ;-) , people consuming a great many random outputs will eventually move to numpy out of necessity (speed). So for that reason alone it's good to mimic what they do. But more fundamentally, they have more people with relevant deep knowledge contributing to the project than Python has. When, e.g., they were considering a Twister alternative, PCG's inventor contributed extensively to their discussion, and even created a new member of the PCG family to address concerns raised by numpy contributors' testing - sll _before_ it was released.
Apart from Mark chiming in, the Python project just doesn't get that level of help in these areas.