you are correct, and I do realize this. Oddly enough I kept telling myself theres plenty of guys with hypertension that get along just fine - but as we all know, thats not how this works 
Its good to hear that it had an impact with your ED. Hopefully it will help with mine. Like i noted, the ED wasnt an issue with my first ~1/2 a year on TRT, but its miserable now. Viagra works a treat but id prefer to get to the root cause. Nevermind the fact that if it is arterial related - that has other ramifications.
I dont know enough about how erections function to analyze it too far, but i know viagra works by not letting blood leave. I do notice that when I can get an erection, i lose it super fast. So it seems that the "leaving" is certainly the issue. Beyond that, no idea if that points to arterial issues or elsewhere. Even on the rare case (lately) that i get morning erections, I recall when I was young, they'd hang around for quite some time. Now I have enough time to open my eyes, realize I have one, and by the time i climb out of bed - gone!
No idea how abnormal this is at my age, as I dont delve into such things very often. However its become enough of an issue, that i not only have to look at trt in general, but am forced to talk about it ;p