I think the issue is that some people either don't remember the stress of an interview or just don't get that stressed so they can't empathise with people that do get horrendously stressed in an interview.
I'm with you on this one, if working at a company induces interview levels of a stress daily, even regularly, then please don't hire me.
I've never had a whiteboard session, these type of interviews are not common in the non-start-up world in the UK. I just get really, really stressed in an interview.
To make matters worse, it seems that I project this aura of calm and self assurance, or so I've been told by two of my interviewers after they hired me, so that I don't even get a concession for obvious nervousness.
I'm with you on this one, if working at a company induces interview levels of a stress daily, even regularly, then please don't hire me.