The video is not a good argument. All the time I saved writing Haskell by being able to use quick check was completely torched by having to refactor my entire codebase, with no tooling, when I realized I needed to thread some configuration state all the way down to a tiny area of my code as well as spending a good 4 or 5 days hunting down space leaks.

Overall, I think I would have been more productive with OCaml. Every language has trade-offs, you just have to understand what they are and how they affect the problem you're working on.