Yeah. I read a lot less about large FP codebases than about large OOP codebases. Wonder why. /s
Some things just can't be properly seen and evaluated in a tiny made-up example that fits in a blog post.
Plus, you have large teams with devs of different skills. Will they all be able to use the wonderful functional idioms that solve all problems and make everything great? Looks like more devs are able to use OOP, warts and all, to create some workable projects. Even if not supremely elegant.