In the early days of my keyboard obsession, I painted all my keyboards so the keys were blank. I was a key watcher, and stupid as it sounds, I still typed better watching blank keys. What it boils down to is confidence. I have a printed black HHKB Pro 2, but unless it's in direct sunlight, it might as well be blank because the printing is black. The way I finally stopped watching the keys is by setting the keyboard on my MacBook on my lap and wrtiting in the dark.
I am thinking about buying a printed white HHKB Pro 2 because, as a professional writer, I often edit my stuff one-handed so I can keep one hand on the mouse to hop the cursor around. Aside from this single issue, I have not had any problems with blank keys. I don't know how much editing coders need to do, so take this advice only if it's a prevalent issue in your craft.
But blank keys are cooler, and no one will use your keyboard ever again.
