It is simple: show us definitive signs of seriousness.
What is a great accomplishment for Tesla, may be a big failure for Mercedes.
A new company selling 40k per year is big, Mercedes selling only 40k EVs is sign of "un-seriousness".
It all ends with battery supply: 100k 200miler EVs per year needs 50kWh * 100k = 5GWh worth of cells.
No believing and arm wavering can replace those cells that they cannot buy.
Cells are made in big factories. Where is Mercedes's one? LGChem? Samsung? Panasonic?
They cannot produce 5GWh for VW, Mercedes, Audi, Kia, Fiat and XY. All of them together come to about 1/5 of the number.
At the end it is not lack of fastcharging network, but lack of supply.
Why is Mercedes not building one for their own EVs? Because, they are *not* serious.