I don't mean to generalize but every time I had to deal with a DevOps team shipping velocity was much slower compared to when I was able to handle infrastructure myself through a vendor like Heroku, Vercel or even plain AWS.
I find myself agreeing with the part about "scaling", meaning a (good) DevOps team makes it easier to integrate new projects into an existing infrastructure that's built in house. The point where relying on the vendors above becomes more expensive than having a full time DevOps team only happens once you react a certain scale.