that was before stackapps.com existed. This is the place do discuss all things related to the API.
I guess I misread the question.
This is my take on it:
Users should not be coming to stackapps and posting [app] support questions, but the [app]/[library] announcement post is meant for those sorts of things. e.g. examples, docs, questions (in the form of an answer) comments, feedback etc etc. as we have all been doing with demonstrable benefit.
How many bugs/suggestions do we see simply mentioned in a comment only to have it fixed in short measure and for all to see.
Of course, an app should have an official home, but while we are all learning the in's and outs and announcing new work, this centralized location is a perfect place to communicate within our small cadre of devs for qualified and agile discourse.
On the announcement post of the code in question of course.
That's just my .2 pesos.