Elk Hunter 04

I've just purchased a 2020 Trail Boss with 5.3 and 10 speed auto. I've seen in 2 different GM forums reference to the need of oil can separators on GDI engines. Is there a GM tech that can advise of the actual need and effectiveness of this? I'm in California and the JT 3.0 is not CARB approved and not available in California. Isn't this an add on that would void your engine warranty. I've had excellent performance, trouble free experience with the 5.3 v8 on my other trucks. Can someone clear the air on this subject?