The raid1e type probably didn't exist when Neil Brown came up with the algorithm.
You are probably right.
He should have patented it though...
Maybe...
Maybe he started out with the idea to create a raid10, but didn't want the complexity of managing sub-arrays so decided just to redistribute chunk copies instead and then it took off from there.
Yes. I didn't want to sound harsh to him. I am VERY grateful for his outstanding work.