This is such a detailed description of the issues caused by red/green color blindness.
I've had some issues in the past specifically related to small red and green boxes. When you do some operations work you'll eventually run into a chart like this [0] and, during an outage, you'll undoubtedly not be able to notice a scattering of small red boxes in this type of visualization. Similar with line charts. Telling the difference between 2 lines on a graph that are not thick is difficult especially now that people have migrated to higher DPI displays.
To be honest, if the boxes were smaller, I couldn't definitively say as I'm also red-green color blind. So I'm glad someone could clear it up for us.
One great example of the case where I absolutely cannot tell is when you have a LOT of tests in something like buildkite https://buildkite.com/features and most API status pages (many small green/yello/red circles/boxes).
I've had some issues in the past specifically related to small red and green boxes. When you do some operations work you'll eventually run into a chart like this [0] and, during an outage, you'll undoubtedly not be able to notice a scattering of small red boxes in this type of visualization. Similar with line charts. Telling the difference between 2 lines on a graph that are not thick is difficult especially now that people have migrated to higher DPI displays.
[0] - http://status.ovh.com/vms/index_bhs1.html