Frankly on larger projects overall time to create and test the whole thing in modern C++ or (I assume) in Rust should not take longer than in Python. I do not u

Frankly on larger projects overall time to create and test the whole thing in modern C++ or (I assume) in Rust should not take longer than in Python. I do not understand this idea of mixing languages where one is enough. In my own case I rewrote decent size Python app in C++ and it had taken me about the same time as for original developers. And no I was not porting code but rather working with the specs so did my own design.