[kbolino]

You go to print a document. Your printer is temporarily unavailable. The print job hits the spooler and sits in a queue. You get bored and launch a game. The printer becomes available. The print driver has to convert the job to PCL or whatever proprietary format the printer uses. Your game hangs or even worse crashes because it's not really designed to run with background tasks on the same cores.

Who do you blame, especially since the usual diagnostic tools of a PC with a full operating system aren't available?

It's a feature very few people will use with lots of sharp edges that people accept on a PC but would find intolerable on a video game console.