[mattmanser]

Bollocks, even in complex environments you should be able to test it outside. You can hook dev machines up to external partners, so there's absolutely no good reason to be using live environments for those problems.

I have seen production hardware or wiring be the problem once in my entire career. And I used to work for a company that ran and supported enterprise software on hundreds of different client-owned servers.

Most people these days will be running a few web servers at most.

EDIT: Worse still, we're talking about debugging javascript here, which makes what you're saying even more preposterous. Wiring, indeed.