The standard version of Ozone 8 doesn't allow you to use modules as plug-ins.

Here's a feature comparison of Ozone Elements, Ozone 8 and Ozone Adv

https://www.izotope.com/en/products/master-and-deliver/ozone/features-and-comparison.html

And for me the memory issue is mitigated as multiple instances of Ozone are not being loaded (I run 32g memory so I could likely load multiple instances of the full Ozone with no issues but the plug-ins are easier to manage...for me).

I've used Neutron for tracks since its inception but sometimes I like to use Ozone's Imager as a plug-in on individual tracks particularly on pianos. I've also used the maximizer at the track level and a few other modules.

And as mentioned the Tonal Balance is a great addition to one's arsenal.