Excellent article and I agree with it to a tee. That right there though will be a friction point among the American gun community. As Americans we like to have choice and enjoy being different. With that comes the AK vs AR vs CETME/HK vs DI vs Gas Piston vs Delayed Roller Lock vs etc, etc, etc.
If folks are going to be honest with themselves when reading this article and want to own a “weapon system” that will be long term and easily maintained with easy to get parts, then the AR is the clear winner.
Barrel, bolt, bolt components, fire control components, springs, gas components, furniture, magazines, etc are easily sourced and easily replaced/installed with either no special tools or a minimum of specialty tools.
Now some are close, but none meet the ease of the AR platform.
When it comes to quality, many have already been listed. Spikes, LMT, LWRC, BCM, DD, AP, CMMG, and the list easily goes on. One only has to do a little research.
When it comes to the AR I’m a firm believer in the DI platform and keeping it as “mil-spec” as possible. Is this a knock against gas pistons? Not at all. I own piston guns and enjoy them. My favorite is my Faxon, which is a hybrid AR/AK, but when it comes to parts it is expensive and except for a couple of parts has no commonality with either the AK or AR.
So when I think long term and maintenance then my go to rifles are my M4 clone and MK12 clone. Simple DI rifles with easy DI gas system that are simple to maintain, BCGs that are easy to maintain, FCGs easy to maintain, and barrels easily replaced with a breaker bar, tongue wrench, vise and block.
So simple a cave man can do it.