[dwaite]

Or AMD calling monitors which meet quality and feature requirements 'FreeSync'

Or Intel calling USB4 devices and cables which meet quality and feature requirements 'Thunderbolt 5'

Compared to, say, manufacturers who aren't willing to meet any certification requirements or to properly implement the standards at play saying they have "USB-A 3.2 2x2 ports" on their motherboards.

Retina doesn't carry the same weight as an industry certification effort like thunderbolt, but it still informs people that a screen actually meets some sort of bar without them having to evaluate pages of tech specs, and reviews saying whether the tech specs are accurate or have undocumented caveats.

Finally, establishing such certifications are difficult - look at the number of failed attempts at creating industry quality/feature marks in the television market.