Disclaimer: Never really used Emacs, but mediocre VI(M) user for nearly 25 years.
I am fully capable of using VIM for developing bigger programs, but I gave up on the wish of setting up VIM as an IDE. Still, IMHO VIM is worth knowing for quick edits, writing and remote work.
Seriously, if you want an IDE for Python and C#, VS Code with the Microsoft plugins is and will be miles ahead of the VIM experience. The Rust plugin for VS Code is IMHO subpar, the last time I tried it. I don’t know what is the favorite IDE of Rust developers.
I wouldn’t want to stop you trying out editors and having a nice journey, but in the last years, VS Code ‘won’ and is used by nearly every developer for a reason: It has not a perfect setup and a lot of annoying issues, but out of the box the experience is good enough™ and is has the biggest user base by far, so show stoppers will be fixed quite fast.
So, my advice would be: Learn vi, because it is a handy tool for quick edits with good defaults (looking at EMACS) and chose a popular editor or IDE for your development needs. The time trying to force VIM/EMACS into a descent IDE will never come back and the theory sounds better than it will be in reality.