Why the neg rep? When driving normally on the road, you will come across lots of drivers who drive poorly, surely being able to deal with them is one thing we should be tested on, if someone comes hurtling towards you, breaking the speed limit, they are wrong, but it doesn't mean you can just continue driving towards them, if you take that attitude you'll end up dead and the DSA test shouldn't just be about can you drive according to a prescriptive list, but can you react and deal with hazards, especially unexpected ones, safely!
With the emergency vehicle thing, lots of drivers do not know how to react. Sometimes it's because they don't know how, and that can be fixed with extra education, specifically around what they can and cannot do under law, of which crossing a double white line (except under the conditions a normal road user may) is something the fire and ambulance services are not able to do. Other people may just not care, and that isn't what education can easily target. Some people also just don't notice that the emergency vehicle is there, and it is cases like that where the hazard perception test comes in handy (perhaps add a clip with an ambulance coming towards the car!).