TLDR: Author just likes C
I love the idea of Rust, but find the syntax to be just awful, and the entire thing just overly complex. I'm not saying that Rust isn't the way it is for good reasons, but the code is often hard to read. Some of the syntax choices are in my mind questionable and serves only to have Rust programmer appear smarter than the rest of us.
Rust shouldn't try to accommodate people like me, because it will make everything worse for everyone. Instead I should look elsewhere, may not to C, I'm not that clever, but to languages like Go, Nim, Crystal or Hare. It's important that we have choices, because even the best designed language, and I do consider Rust a well designed language, will fail to appeal to everyone.
Nobody SHOULD use Rust.
Some may use it, but nobody should.
And because of this "should" many will not use it, especially when you consider that the language is conceptually overweight and there was already one "very popular" conceptually overweight Scala language, which now only the old people remember (laughs).
Getting hung up about the choice a single word in a comment is a little weird and makes you appear rather annoying.
You can use search for the next criteria: why you should use rust
This informational noise is very disturbing and forms a somewhat distorted perception of reality, because it profanes the choice of a very complex instrument (which is just a small part of the huge instrumental set). And thanks to this noise, the obvious boundaries between the apparently different "must" and "can" are lost.
I only talk about this and nothing else.
Because very little of what people complain about is actually syntax and is actually semantics.
But closure syntax is awful
Overall, it feels like a nice combination of Pascal and Python. At least, reading Nim code is usually easier than Rust.
On the other side, I'm still interesting in learning Rust. There are some open source OS kernel projects written in it.
To be clear, I don't mean to disparage the author's decision. Programming can be an artistic endeavour, where personal enjoyment trumps most concerns. If programming C is what keeps you motivated, go ahead and use it! Just be aware that this may make your software risky to use and rejected in many real-world situations.