[yawaramin]

I don't think it's really a contradiction. In a startup you still have to choose the quickest path that you think will lead to success. It just depends on what your definition of success is. RoR can be a safe choice even for Haskell devs if they just want to build an off-the-shelf webapp with all the trimmings. But if your definition of success is that you want to create a formally-verified smart contract platform and cryptocurrency, you're going to use something like Haskell or OCaml: https://github.com/tezos/tezos