It does and it doesn't. You won't find a 10 with a miswrap for example. For the things not taken into account, I think using one's own eyes is sufficient. I'm probably in the minority here, but I also think that the grade is enough. If you want a perfect book, buy a 10 or wait to save up for a 10. It boggles the mind that a 10pt scale with 10ths needs to be escalated by a fourth party. I think it's probably inevitable that CGC will carry out to the hundredths, at which point i'll be happy to be out of collecting.
That works for you and that's great. For some, the technical grade is enough. For some it isn't. Not all 9.6s (for example) are created equal but that's a matter of personal preference.