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Good advice Randy, the edge should be sharp enough to move off the nail test before 8K (I don't hone with either 4 or 8 K myself very often, thus didn't like that "rule").

I did some research...

Your welcome, sorry if I confused you . . . unfortunately this is a process better done by reverse engineering. Hone until you have a perfect razor, then conduct every sharpness test on the planet...

First, no. In my opinion conducting a thumb nail test after an 8K is fine. I would actually suggest that it would be prefered.

Second, here is the only rule. Do not do the thumbnail test...

I don't know where you've been reading or hanging out but here is my limited experience. First, before stropping you can check the edge quality by running the blade lengthwise along your thumb nail,...