Excellent clarification. For some reason I jumped to some conclusions when writing that at 4am. lol.
I 100% agree with your engine detailing and the "warm but not hot." I have never personally had problems with water spots, but I'm sure there are some who have and thinking further it is a good option in some cases.
As for point #16, I must have missed the "or wash car again." My bad.
Overall, good resource!