Exactly. The proof-of-concept app should address the core technical obstacles in the new project, and prove they are surmountable in the simplest possible way.
Alternately, a PoC should address the core business and usability questions. Everything else, including technical feasibility, is secondary and trivially solved with enough resources.
In the order of importance, the first question is "is this worth doing", only then you ask "how can we do this"
Good point. I'm a dev, so by the time this kind of project reaches me, the business angle has (presumably) been sorted out, and it's the technical feasibility that is in question.
Alternately, a PoC should address the core business and usability questions. Everything else, including technical feasibility, is secondary and trivially solved with enough resources.
In the order of importance, the first question is "is this worth doing", only then you ask "how can we do this"