You are right, I prefer highly scalable and proven in production open-source tools, such as Redis and Postgres, to managed services by some cloud provider. It c

You are right, I prefer highly scalable and proven in production open-source tools, such as Redis and Postgres, to managed services by some cloud provider. It comes as very little overhead, if you pick the right tools and master them, then re-use. But I understand your point about just connecting a bunch of APIs and being done with it, if you personally don't own the product, or if you are expecting to sell it soon. A nitpick: I don't host my own object storage, I just pick S3 alternatives that provide standard APIs to access them.