Solely testing out the etron's route planner after the last updates (Service Pack 2 and MMI), in the past two months (June-July 2020), drive assist does seem to predict curves and intersections better using the native MMI Navigation than using third party apps on the cell phone via CarPlay, like Waze. When using Waze, the car doesn't activate the electric deceleration intuitively on exit ramps or intersections causing me to tap the break pedal and drive assist deactivates completely. However, using MMI, drive assist activates the electric deceleration on the vehicle significantly where all I have to do is press the acceleration and drive assist does the rest. As if the etron is mimicking one-pedal driving.
Also, the milage availability reading seems to account for the terrain (inclines/mountains) on the route and calculates mileage availability more accurately.
So, when the 6 month free trial ends, I'll be locking in the Connect Prime subscription for 18 months without the onboard wifi (Connect Plus). If you feel you won't need the voice control (Alexa) and Google Maps support, I think the default Connect Care is sufficient. I just prefer the convenience of having Google search and maps integration with MMI. IMO it truly makes it a "smart" vehicle.
Going forward, I'll only use Waze when driving around New York City/Brooklyn during peak rush hours for more minute by minute closure reports or road alerts.