I love how you guys dismiss evidence that doesn't agree with your POV.
AROOGA! AROOGA! IRONY ALERT!
With the greatest respect, no one's presented evidence. You've posted, what, three photos, taken on a relatively cheap camera (bearing in mind that even something like a Nikon D3 falls some way short of the abilities of the human eye) of a particular circumstance. As if that's not enough, you've taken them with the sole purpose of backing up a preconception of yours, viz. (ho ho) hi vis is no use.
My experience - which is, though you may not like it, just as valid as your snaps - is different. When I'm approaching a cyclist from behind, I find it easier to work out what they are earlier if they're wearing a hi vis tabard, no matter how bright their lights. When I see someone on the pavement wearing hi vis (I'm thinking of a particular group of joggers whom I see quite frequently), I find that I often see their reflective stripes before I see them, even though my headlights aren't pointing directly at them. And when I see a cyclist coming towards me on the other side of the road, there's nearly always some light reflected back at me if they're wearing a hi vis tabard.
You may not wear it yourself, and that's fair enough - as I said, I'm not campaigning to make it compulsory or anything - but you shouldn't dismiss it on the basis of three snapshots. It certainly doesn't make anyone less visible.