huh, I mean idk experiences differ. My main project's service is written in Rust/Axum, and I enjoy it a lot. But I thought it was actually kind of frustrating to find that combination; Axum was the 3rd http client I tried, after the first two failed me in different ways. If I had started with the https client first and hadn't already felt good about building the codebase in Rust, I might have just gotten annoyed and moved on. First impressions can sometimes skew the perspective a little.

fwiw, re finding up-to-date packages, you can also pull in npm dependencies. idk what you found confusing about the deno.json, but it's definitely optional; you can just write imports directly in the .js file if you want. I often make single-file scripts to run some npm package over a local file.