Well, not sure it is that coveted generally, but it is for me since I bought a Clearview taller shield that is the shield only, so I moved the hardware to that.
It's ideal for longer trips, but gets quite warm during hot summer days and even affects how well the helmet (and me) ventilate, so it would be really nice to be able to make use of the quick release functionality to just swap on a short screen when I felt like it. I can buy the hardware new but it gets pretty pricey.