There is absolutely no comparison. The quick navigation keys allow you to do something of enormous value that you couldn't do other wise. They allow you to move by structure on web sites. There is no sighted equivalent because sighted people can just look at structures on web pages. Its as though you asked if the read title bar command should be in screen-readers but nop virtual ribbon menus. Again, the read title bar command gives you access to something sighted people can just look at and it gives immediate access to very important information.

the virtual ribbon menu JAWS implemented does nothing that is not already done as well or better by ribbons. It provides an unnecessary interface that limits blind people. By limiting, I mean that instructions for sighted users always use the real ribbons, of course, and tutorials for blind users usually use the real ribbons when giving instructions. Therefore, you are significantly limited if you know the JAWSS interface and not the real one.

Have you tried to learn ribbons and not the JAWS special interface? If so, what problems did you have?

Gene