You seem like a Nimmer. What would you describe as the biggest downsides of Nim wrt Python? (aside from the fact that it's currently a niche language.)
The only two that I can think of are due to static typing:
You cannot enforce types only where you want, like mypy. Yet, type inference and automated conversions help quite a bit.
There's an unofficial REPL in the compiler but you cannot do dir() or tab-complete methods/procs. You have to rely on documentation, nimsuggests or IDEs instead.