I think - I am an electrical engineer working in the offshore industry, so I have only superficial knowledge of shore-based installations - anyway, I seem to recall that the Norwegian electrical code calls for Schuko not being used to carry more than 10A continously, 16A intermittent.
However, until relatively recently, the average residential circuit was 10A, though you could get 16A if you asked for it - typically for tumble driers, washing machines and the like - so the market for appliances requiring more than 10A was quite slim.
I am sure the appliance stores didn't want to have to explain to each and every customer that the beefy kettle they had just put on the counter might not work at their house - hence, 10A appliances for all.
(Incidentally, I have a 3kW kettle I bought in the UK and a couple of 16A outlets on my kitchen counter.)