And yeah, I get what you are saying, I'm using it the same way you envision snikket, just for my wife and I. Considering how much time I spent on the initial setup, I can very much see wanting a preconfigured version.
I guess the site was just too "non technical" and went over my head when I tried to grok it (before, a while ago, and now before writing the comment), the lack of a download option for the client on the snikket site combined with repeatably talking about invites just rubbed me wrong.
As I have already setup my server, and have gajim/conversations (which afaik are the best modern Windows/Android clients, for Windows probably even the only one storing modern xmpp) for desktop/mobile, I have no need for snikket, but my view now went from negative to very positive ;)