Yeah summer gets hot, but 86.9 at night isn't really hot. I wouldn't open my windows, but if you are outside it feels good. Yesterday my wife and I were walking around (in the shade) after getting coffee, and commented how nice out it felt. Turns out it was over 100 out. Desert heat feels different than any other heat I've felt.
Night desert heat is a... unique experience that I too find enjoyable, but your air conditioner is running 24/7 to keep the house below 80. And in Phoenix, there is not enough night activities and/or legit nightlife to take advantage of pleasant nights as opposed to oppressive days.
Scottsdale or Tempe may be a different story, but then you're driving anyway. Or you do live within walking distance, but then you're no longer paying Phoenix rents.
I live in south Scottsdale, I work in Phoenix roughly a 7 minute drive or maybe 20 minutes by bike on the canals. I'm not as familiar with downtown as I am Arcadia/South Scottsdale/Tempe. But I do love getting downtown for a change of pace.
There is very little humidity here. I would say 88 degrees feel more like 72 degrees in a place that is not a desert environment.
Also, when you live in Phoenix, your body changes and you truly do acclimate to the heat. Anything under 65 feels like below freezing after a few years of living anywhere that is warm year round.
