TBH, Rust's other extreme of never converting any numeric type anywhere is also annoying, and leads to overuse of casts and/or accidental truncation.
Fortunately, memory allocation in Rust is easier, and the whole `malloc(elem * size)` chore just doesn't exist.
As a career C programmer, this drives me crazy. I kind of get it from a object storage size perspective, but the side-effects are awful.
But of course, it's too late to fix it. Better just burn it all down and switch to something completely different. Oh hey, Rust!