When Rust was able to get rid of a class of memory bugs, undefined behavior, concurrency bugs without a garbage collector, it achieved a breakthrough. You can now write JS or Java VM in a language that doesn't have buffer overflows, dangling pointers and all kinds of other nasty security vulnerabilities.
Nim doesn't GUARANTEE memory safety, so it's basically... better Pascal? It's an iterative improvement that nobody is getting super excited about. Why is it better than D, V, Delphi?
Rust doesn't guarantee memory safety.
I think anything that can generate a trivial hello world program that doesn't leak memory is better than V.
It provides 4 choices: default optional GC (that can be turned off), autofree (either alone or with GC), arena allocation (-prealloc), or manual memory management (-gc none). This flexibility has already been proven, like with their Vinix OS project[2].
Lastly, for developing languages going through alpha and beta phases, think that people should acknowledge how the process works and update their information. Rust or Nim, for example, aren't the same language they were 5 years ago or when still in beta.
[1]: https://github.com/vlang/v/blob/master/doc/docs.md#memory-ma... (4 ways to manage memory in V)