I agree with the observation (most people do not contribute to libraries), but I think the arrow of causality is little different. Python is used as a glue code in scientific computing on top of libraries written in C/C++. The development ergonomics of these languages are intimidating for many people, with both languages having enough footguns. The net result is no-one wants to peek under the hood and see how things are working.
A fresher take on scientific computing like Julia, if it is mainstream, might enable more contributions and in general understandability of the black box algorithms.
A fresher take on scientific computing like Julia, if it is mainstream, might enable more contributions and in general understandability of the black box algorithms.