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That's actually not my understanding. I have heard that most man-made stones are nearly flawless (at least when it comes to occlusions).

Some processes have actually started introducing "fake" occlusions just to make them impossible to distinguish from the natural variety.

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Nah, you need all sorts of quality grades for drilling, polishing, etc.

No you don't. Those aren't the hard parts. You use the same high quality, industrial machines to cut and polish synthetic diamonds as you do natural diamonds, and you get the same result. The only quality grades that make sense are color and perfection for natural diamonds, or maybe cutting grades for antique hand-ground diamonds that weren't done well.

For polishing and drilling marble, for example. Not for polishing diamonds. The diamonds are different qualities.

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