NGCX appears to copy the present 60-70 uncirculated coin range into its 90-100 range. Then, it spreads circulated coins currently occupying 1-58, into zero to 89 (or maybe 1 to 89). The result is to give sellers more tiny increments in which to confuse and price gouge collectors. For the TPGs, it opens lots of "necessary" regrading submissions, thus increasing revenue by re-doing decades of paid grading events.
The small increment grading of circulated coins merely adds confusion and inconsistency to an already messed-up system. Almost every coin will have to be accompanied by an explanation of why it is "graded" 5.2 and not 5.3, and when combined with the absurdity of subjective/opinion in grades, the whole thing becomes a useless mess. (Well, more of a useless mess than it already is.)
Coin grading demands: 1) stability, 2) objectivity, 3) empirical data standards, and 4) consistency. This is something ANA tried to do in the 1980s, but then they got "spinus dissolvus" and sold out.