1 phase 16A is still not really good - only ~3.6 kW at best. But 230V still makes the cabling easier to handle and 3-phase power is common in residential buildings (at least in parts of Europe), so 11 kW (3x16A) or 22 kW (3x32A) are usual sizes for electric car chargers at homes.
Bigger restriction on that is how many people don't live in homes where they can just install a charger, but rather in apartments with either no charging or no dedicated parking at all.
Right, electric cars are too inconvenient for most apartment dwellers, but contrary to a popular impression, there are lots of Europeans who live in single family houses. Additionally, even residents of rural European areas are driving much less on average than rural Americans, simply because what counts for rural in most of Europe is already denser than rural America, especially in the west portion of it.
I think the biggest reason for relatively slow adoption of electric cars in Europe is simply that most European are significantly poorer than most Americans, while also having to pay high taxes and fees. Median household income in Mississippi is almost 50% higher than median household income in France, for example, and this is compounded by higher taxes in France.
Many live in single family homes, yes, but in the UK at least they very often have shared street parking across a pavement (a sidewalk). That is why I was thinking lampposts.
Bigger restriction on that is how many people don't live in homes where they can just install a charger, but rather in apartments with either no charging or no dedicated parking at all.