well it depends.. remix is just the compiler, your backend is just whatever node/cloudflare/whatever framework/libraries you want. so no, it's nothing like rails in the batteries-included sense, but if someone built their server using node previously, it's the exact same using remix
So does not surprise if he is doing this as an acqui-hire to get more quality RoR Devs to join Shopify!
[1] https://www.youtube.com/watch?v=HDKUEXBF3B4