That's the issue with the height, higher to fall no doubt. When you look at the injuries sustained tho, height won't make much of a difference. My mare is going to be tall and average build where as my boy will be shorter but is going to be very thick.
I'm 5'9, but don't really care what I look like on the horse as long as the horse and I are comfortable. I find my preference are short and stocky - like haflingers. The big barrel takes up my leg but they are easy to get on and are a load of fun on the trails. My husband who is 6'4 also likes short and stocky, but his "short" is 15 hands instead of the 14 hand average of my horses.
I actually don't mind riding a responsive horse that is over 16.1. I'm 5'1 with pretty short legs, so a non-responsive horse just doesn't work. But to be honest, I'd rather ride a 17 hh horse than a 15 hh horse, don't ask me why, but I feel way more secure on a big horse.