These red dots are built to stand up to competition use. That's a lower bar than combat, but it's still thousands of rounds getting battered back and forth on a slide.

Competition is a higher bar than a self defense gun, or a duty gun for a police officer. Most people are not running thousands of rounds through duty and defense guns. We run hundreds of rounds, become proficient, and then shoot a variety of guns for fun. The defense guns come out for range trips but they aren't doing competition numbers.

If people want the best, of course they should pay for it. But there's no reason to buy military durability for use cases that don't require it. A mid tier red dot is reliable enough for competition, which means it'll be fine for the vast majority of folks who aren't getting into gunfights on a regular basis.