2+2 doesn't equal 5. The media will impart what it will impart where it's rubbed. There's no way around it.
One can abrade more steel (i.e. go 'deeper') as far down the back of the cutter as one would care to go (and indeed one will over time). This is usually pretty far because it's easier to register more cutter on the stone when lapping the back. Doing this in a restricted area is a bit of a timesaver at best, IMO (ignoring Derek's assertion that the back bevel acts as some sort of barrier for wear moving down the back).
For my slapdash ways keeping up with a back bevel would just be another opportunity for something to go wrong, jigged with a ruler or not. And as previously mentioned, I'm gettin' there anyway. Can't avoid polishing down the back even if I wanted to. I'm just letting nature take its course, letting the stone do what it wants to do.
I'm sure my cutters have more scratches than the one in your photo. A black Ark won't remove them, in fact I'm sure it actually causes them. I don't believe them to be of any real consequence at all. File it under I'm probably better off not looking at my cutters through a microscope. Like a tiny insignificant insect, they look like horrific monsters/Marianas trench (as it applies) under magnification.
I'm sure if I loaded the cutter in your photograph, even sans the back bevel and with those very tiny scratches, I would find it to be blistering sharp and more than up to snuff.