- It has a bus/lottery factor of 1. The vast majority of all the changes were done by Araq and I have very little faith that the language would survive without him. This is even more pronounced with Zig (mentioned in comments here).
- It has had some very embarrassing bugs after the 1.0 milestone. Most of them were specific to Windows (e.g. [0]), which casts a lot of doubt on its cross-platform promise. Multiple times in the last year, when debugging a nim program, it turned out that the problem was in the language/standard library.
Now, these might not be reasons enough to not use nim, since it's a lovely language when it works, but a pro/con list should be honest.