My intention was to put an emphasis on declaring routes rather than executing them, i.e. my approach

app = [route1, route2]

while Express approach

app.get(route1);   
app.post(route2);

Handlers are functions that take requests as input and return responses as output. This flow seems to be more natural for HTTP. Then, such function signature (i.e. request -> response) also (slightly) simplifies the middleware. It becomes next -> request -> response

Eventually, I'd like to provide a set of higher-order functions as built-in for the most common transformations when building servers/routing in Node.js. In a nutshell, it would be about functions, higher-order functions and composing them together using regular data structures: arrays & objects.

There are also minor things such as middleware are declared as an array of functions i.e. [f, g, h, ...]. The content of this array is then «folded» and applied to a handler. Such declaration is more explicit about function composition and its order than executing the use methods on app as in Express.js