Dave- Dr. Holland writes this in the article
"A useful partial solution would be to allow customers to manually set a peak charging rate (below the safe limit) that minimises heat gain and gets predictable results. The rate options should be 20 to 35 kW in 2.5 kW increments. Grey out/disable higher powered options as they become unavailable due to overheating risk. Ideally, make the power curves on these options flatter and less peaky (peaky = heaty). This will allow the customer to access more modest but more sustainable charging power and less overall heat gain during a long journey.
46 kW charging (adding 70%) takes 38–40 mins, but adds 20° Celsius of heat. 28 kW takes 53 mins, but adds half the heat. 23 kW charging takes 64 minutes, but adds just one quarter of the heat. 23 kW (or 22.5) would be ideal for a meal break, for example. These manual options would make a big difference to the user experience on a long journey."
The idea is to avoid, or at least, delay for a meaningful time, excessive battery heat when driving the Leaf on a long journey.