What problem does this address?

The Block Editor provides a great warning when background/text colors lack sufficient contrast to be easily readable, but could perhaps be improved to specifically call it out as an "Accessibility"-related issue. We have been educating and pressing our content providers hard to improve the accessibility of their content, and I think that using that word here specifically would help people understand the gravity of the situation and make them take it more seriously.

Image Description:

What is your proposed solution?

Specifically cite that this is an "Accessibility" concern in the notification.
The current text of the warning is: "This color combination may be hard for people to read. Try using a brighter background color and/or a darker text color."

There are lots of options for a solution. I'll outline a couple, but this ticket is being created at the request of the #accessibility chat where they wanted additional feedback or suggestions.

a) Add some text to the end, such as: "..... or a darker text color to make the content more accessible."
b) Add a helpful link below the paragraph, worded something like: "Learn More About Contrast Accessibility" that links to a trusted resource
c) Add a small heading before the warning, saying something like: "Accessibility Warning" or - to be less scary - something more like "This content could be more accessible."