It could mean more accidents due to these things unless they put the pass score of things like these to a different percentage as they know that the parts will wear out well before the next inspection.
Or maybe they need different levels of warrant 6monthly and yearly with the yearly one needing things to be up to a higher standard to pass.
I agree that 3rd party insurance should be compulsorily, help get some of the Car enthusiast's (boy/girl racers off the streets).
Supporting or not supporting this to me comes down to if you want to have to front things like the excesses if someones runs into your car, one of my insurance company's things that I must supply the person's insurer if I want to avoid paying the excesses initially myself.
I don't know if uninsured is a response they will accept I will have to ask them.
You can also look at it from the uninsured persons point of view, would you want to pay the full costs to fix someones Jag or BMW you ran into.