Rust is much lower-level than Ruby, so in general you're going to be a lot more concerned about memory -- in this case, satisfying the borrow checker, dealing with stack vs heap allocation, etc.

> the finished product is as easy to work on as our Ruby code

I... highly doubt this. It's harder to hire Rust programmers than it is Ruby programmers. It's harder to teach Rust than it is Ruby. And, again, your Rust code is going to be much more in the weeds than Ruby would be. Rust also is a pretty complex language -- there are a lot of concepts to learn if you want to use it well. Ruby is fairly easy to learn.

I'm not saying that Rust isn't the right language for you, or that Rust is bad (I love Rust!), I'm just saying that it's much lower level than Ruby, and that comes with tradeoffs.