It's not the only form of bias in the post. Just looking at the first pair, he seems to be implicitly criticizing the inclusion of braille for introducing addit

It's not the only form of bias in the post. Just looking at the first pair, he seems to be implicitly criticizing the inclusion of braille for introducing additional elements into the design? What does he expect in a hospital? I'm not familiar with that particular hospital in Atlanta, and I think the panel could be improved. But in my experience working in hospitals, there can be really weird floor layouts that make navigation confusing in general, not just for elevators. Hospitals also need clear communication for staff to increase response speed. If you say "Floor 3" it might be really unclear what floor on what subunit of what building you're referring to, but a color could be a clearly defined zone. Part of what he's doing is holding up as ideal examples places whose architecture and use makes simple elevator control design possible. I think it's good to highlight elevator control design, but I have a number of issues with the way he's approaching the discussion.