The scale between 9-10 doesn't seem very intuitive. 9, 9.2, 9.4, 9.6 9.8?
0.5-9, sure. Which is similar to PSA, CGC, BGS in the trading card world with half grades, which is the only grading I have experience with. As for 0-100 in the case of VGA, I'd argue the decimal point has just moved (i.e. 80 = 8.0)
I may just be biased since I'm not a fan of how the WATA case/label looks