Maybe it’s because crypto actually needs the advanced features and correctness that Rust provides, while language doesn’t matter for most of your basic CRUD jobs so people use JS or whatever
Is it a hack if the contract programmatically allows you to do it?
Or is it a hack if you didn't understand the scope of your contract as you wrote it, and are now upset someone executed on it in a way you didn't expect?
If you choose to go through the effort, Haskell can be shown to be provably correct -- that is in a mathematical sense of the term "prove" -- similar to Ada/SPARK.