For very simple backends, it's very unlikely you'll get any significant number of bugs with an experienced team, and if performance isn't really a concern, then Rust being faster isn't really relevant. For anything more complex than a simple backend, I'd agree that Rust becomes a lot more appealing, but if you just need to throw together something that handles user profiles or something in a very simple manner, it really doesn't make a difference what language you do it in as long as you write a few tests to make sure everything works.