Speaking of coasting, I learned something interesting on the Ioniq forum. Sitting at a stoplight, the motor is drawing half an amp (for the crawl function) in drive, zero in neutral. While actually "crawling", the motor is drawing 2 amps. Crawl is evil! I'm going to try to get into the habit of shifting to neutral at a stop to save energy.
On a related topic, I did a really long coast down in drive on the flat. At exactly 6 mph (or 10 kmh), it stopped slowing down and regenerating and switched to crawl. Clearly, if one is actively braking, physical brakes have to be blended in by 6 mph. Could happen a bit earlier, say blended braking starting at around 10 mph on a slow or normal stop, but I, like so many others, cannot tell where blending begins. I only notice the physical brakes on the last few feet of a normal stop. Anyway, that give a good hint for others who want to know where the physical brakes are engaged. For fast or panic braking, all bets are off!