Curiously, this feedback is actually making me interested in reading the Rust book. I enjoy humour and personality and wish there was more of it in business, as long as it isn't forced. (I've not read the full guide/book yet to see if it tends more towards personality or forced.)

Looking at that Julia example, I find that far too dry and academic. (The presentation is great though, better design.) For a scientific computing audience it's probably ideal, but that isn't for me.