Yes, it is a good thing but I do not see how it is zero config (and generally I do not think zero config is a good thing). Selecting your set of middleware is config.
The zero-config aspect is that in order to add my own middleware to my app, I drop in a file with my middleware function into a directory and that's it. There is nothing else I have to do. Just like if I want to define a new API endpoint, I drop in a file in the corresponding directory with the endpoint function defined and that's it. That's zero config.
They took all the ease of the old PHP approach and made it better.
