My toyota has lifetime trans fluid, which smart owners change every 100k. Chevy iirc was the 1st to try this in the corvette transaxle. It makes maint a lot harder if you keep a car more than a decade. No fluids additives can last that long. You will just end up replacing whole components instead of servicing them.

And all ecars have at least a differential, and many have gearsets, even if they do not shift. These are mostly heilical/hypoid style gears. That fluid uses shear additives that need to be replenished to abate wear. If you have not changed your trans/diff fluid in over 100k, now is the time. Your jeep, having a solid axle, is tremendously more simple and overbuilt than a normal car too. Extrapolating from that is not accurate.