Yeah totally agree with your statement.This is how I view the Type 96G. The Type 99 came out but required further refining, and the basic Type 96 design was alright but it had obsolete equipment and turret design. So when the Type 99 had new variants rolling out soon, the technology was implemented on the Type 96 to improve its capabilities. And also its easier to mass equip the army with Type 96 or convert by modifications existing old Type 96 to G variant. Keeping the old design to save cost, rather then creating a new project to equip the East and South division armies with a new Main Battle Tank. Also bringing the Type 96 to around Type 99 standard but without the excess of 50t weight issue for the East and South environments.
So far all articles gather gives a number for the Type 99 of all variants including the elite showcase models to be around ~500, and for the Type 96 around ~2700-3000. So if your looking only on China Tanks its nearly reaching 50% modern-advance Main Battle Tanks in numbers for its Ground Forces.
But I also thought of something along the lines of less "T-72". Like with a bustle autoloader so it's less likely to blow up from enemy fire. Cause as everyone knows that happened to many T-72's over the years when facing western tanks. I'd be horrified if that happened to Type 96G + Type 99..... Are bustle style autoloaders that hard to make..?