For me, the nicest thing about having my computer on my wrist is not that I can easily see it (although that's a good thing) but that looking at it doesn't require me to do anything with my hands. I can easily, for example, be spooling up the line from a bag I've shot, and still monitor my depth.
I agree fully, but don't you find that your computer always drifts to the outer edge of your arm, so that even though you can easily see the instrument, you have to nudge it or move your arm to read it? I find the same cycling with a wrist watch - obviously I can see it without removing my hand from the handlebars, but usually I can't actually read it.