the Coroner is entitled to offer advice when she or he thinks that a death (or, in this case, two deaths) exposes a risk that affects others. What she or he is not entitled to do is to disregard the numbers. Millions of people use the blue painted bits of road without a problem, but a small, indeed tiny proportion of the motor vehicles on London's roads are responsible for about half the cyclist deaths - and there are solid reasons for that being the case.
So - the coroner takes the word of a man who belongs to that tiny minority, and goes for the cheap headline. In doing so she has a pop at a system that can be shown to have reduced the number of casualties per million miles ridden by cyclists. My guess is that she's hooked in to the crap LCC propaganda that represents the needs of the organisation (in a very material way) rather than the aspirations of cyclists. She's a complete, total muppet - and utterly unfit for the job. Time to go.
Oh - and as for blind spots - see also fresnel mirrors.