Yes, agree believe what we want.
In my case, testing at same commercial charging stations would indicate for my 2017 selecting R+ does matter. At 3 different locations, wo R+, I get the same draw, 1.2 kWh or 6.6 kWh. With R+ selected, it varies based on Predetermined Departure time drawing at rate needed to achieve 100%.
So in my case, for my car, having tested, I believe it matters. Not having a home charger which can override, I make no warranties.
Jeff in NYC
MB '17 B250e; MB '06 E500W; MB '81 380SL