About 50% of the population in Germany are renters, not owners. And for the other 50% owners, many just own a unit in a multi family building, not the whole property.
For manyyyyy of these people there simply is no option to conveniently fast charge their electric vehicle at home. No renter will want to invest in a pricey wallbox at a property that they don't own - even if the landlord would allow such a wallbox to be installed (most don't want any modifications to their building). And for the apartment/unit owners, a German court has decided that all the other unit owners must agree to such a wallbox being installed, so that's another obstacle.