#1 They don't think they need it.
Or.... they keep thinking (or know) it's cheaper to live w/warranty replacements and live w/the reputation (which might not be well-known outside EV enthusiast circles) than to add to the cost and complexity. And, it's likely not worth it for Nissan in many regions Leaf sells in outside the US. Also, see my earlier references to Tesla. Remember that Tesla's net losses (including profitable quarters) are still over $5 billion, so far.
#2 Why would they?
#4 Bummer, but I'd imagine it's to keep their competitors guessing and on their toes. There's not much advantage in Nissan releasing the US price now when they're not making it for sale yet.
#6 A huge bummer, but he didn't do the 40 kWh unveil either. And, it seems that Nissan management/its current CEO is determined to throw the book at him.
#8 I wouldn't be surprised if Hyundai/Kia "competitors" are virtual vaporware in the US outside California. If it's like the Ioniq BEV, it'll be So Cal only, selling in tiny numbers.