I occasionally use a loupe on a blade (usually a gouge, not a SR) to see what is going on with it when it doesn't "sound right" on the hone. You can learn a lot about your honing style doing it. Interpreting what you see is a whole other problem. I usually use the magic marker test first, though.
I do know honers that will sit and pour over the bevel with a microscope and do touch ups under the microscope. Maybe their blade cuts 1% better than mine, but is the time to achieve that 1% worth it? They think so, I do not.
After a few hundred hone sessions, you will start to know when the bevel is set by the sound and feel of the blade on the stone. Until then, I'd say do whatever you want/have to do to get the shave you want.