I'm not sure about that. The testing problems are different, but not harder. An exchange has to deal with massive scale, but isn't hugely complex (relative to

I'm not sure about that. The testing problems are different, but not harder. An exchange has to deal with massive scale, but isn't hugely complex (relative to a spacecraft, which deals with fault tolerance and integrating many different inputs; or the mathematical complexity of medical imaging). It seems to me that most aspects of scale aren't too difficult to emulate, given sufficient computing resources to generate the load.