No argument from me. However, I think we both can agree that if one is hunting an area where 250 - 500 yard shots would be somewhat routine, the .223 would not be the rifle I to recommend. I keep drop charts in all of my blinds for that "just in case" shot that is beyond the usual 70-150 yards that includes the .223, .243, 30-30, .270, .6.5 Creedmore, 308, 30-06, 7mm Win Mag and .50 ML. The longest shot on our property would "technically" be 450 yards based on 85 acres and topography. I don't include the .223, .243, 30-30 or .50 ML beyond 300 on my charts.
So, you are right. Even with a 16" barrel (common to the AR platform .223), the cartridge will work for longer ranges, but IMO is not ideal for them unless the hunter is also highly proficient. What I do like about the .223 is that there are several light weight and the cost for practice rounds is 20 cents for FMJ and 50 cents for some hunting rounds.