I only have 4 ARs:
2 with iron sights
Troy Di-Optics rear sights which IMO are a great invention, makes the front sight post much quicker and more sharp to me.
1 with Eotech 517 (w/BUIS)
1 with Accupoint 3x9
I agree iron sights have a strong appeal to them. They just seem "right" on the AR.
But optics certainly have their place as well IMO.