So what? It just takes a month long time investment to be used to kubernetes(many people already have some experience from working for employers), and after that it takes one or two days extra days to make some project as easy to deploy as heroku. So basically it is a fixed learning cost. Obviously if someone is looking to get something up as soon as possible and doesn't have kubernetes experience, it is better to not use it.

But for me, the fixed learning cost clearly paid off. Kubernetes is lot better than alternatives if you want to assign fine grained securities, namespaces, complex scaling rules, using multiple clouds, multiple node types etc. Even if I don't need any of these now, I am not giving any extra time investment for new projects and it guarantees I don't need to do any migration to some other form of deployment if my project becomes big.