It either gets in the way of equipment or leads to a feeling of a small field of view. They want as much of the outside world showing as possible to make it apparent that the characters are driving. At least that's what my director friend says.
A lot of our local agencies do 4 days, alternating, 12 hour shifts. It's a lot easier to do with school. Of course, Utah is pretty quiet. Most places near me have at most 1 call per day. On a fast day.
I remember halfway through my clinicals, I was shocked to find that after all the hours I had put into the course (in actuality about 180 at that point, I had a veeery long course) I still didn't feel adequately prepared. I came into it expecting a comprehensive knowledge and understanding of...
That's to some degree what I took it for. That and it's just something that felt right to me. I really don't see the problem with it as long as the person is driven, good at what they do, and committed to their work. I'd even think that any doc that's been an EMT in the field would treat us...
Financial company for three months. Then training. After that, (hopefully) medical jobs all the way. As long as there's an opening, I'm willing to do it.
You could always make something up. As long as it's believable, no one will bat an eye. Only the grizzled EMS vets would notice, and even then they'd chalk it up to regional differences.