>I love how everything is hackable via Python APIs.

It is hackable with languages other than Python too. The Python interpreter has no restrictions to access and execute everything it likes. Contrast this with Gimp, which it's Scheme interpreter cannot access anything except objects inside Gimp.

This opens some security hole risks in Freecad, given that plugins can execute arbitrary code in the user's machine, but that means one can write C, C++, Rust and automate the gui.

Freecad btw, very unfortunately, it loads each .so external library only once, and it will load the library only with different name or version number. I lost 5 hours messing up with Python versions and .venv installations till I figured that out.