I also took issue with the Xbox example, and I think it's a context issue. When I read it, I interpreted it as an API for new apps/games to use. In that case, they should be testing on an actual Xbox before shipping! And why would the app be trying to print in the first place if it's designed to run on an Xbox?

But I suspect the situation this is being designed for is existing PC apps being ported to an Xbox. OK, in that case I can see fudging the API since there might be obscure corners that the devs didn't think about that try to print. But I'd still say the devs should be testing on an Xbox and make an effort not to attempt to do things when it doesn't make sense for the platform.