You are preaching to the choir here. Fluentd (as a proxy for my logging-related beliefs) pushed Docker to have logging long before the logging driver, and now it is one of the officially supported logging drivers.

What you don't seem to realize is that the cost of centralized logging is not always worth it. Machines are ephemeral and so are many application related problems. It's one thing to counter the OP saying that centralized logging has merits (and I believe the OP agrees with that statement) and another to say centralized logging is always a must.