Suppose we accept that images are allowed, at least sometimes, as discussed in Whether or not images instead of FEN/PGN are allowed. Now the question is: How should we serve users who cannot access these images?
This seems to have been covered already in Editing Help:
The word in square brackets is the alt text, which gets displayed if the browser can't show the image. Be sure to include meaningful alt text for screen-reading software.
But users rarely (if ever) comply with this advice. And it is hard for them to do so, even when they want to. Whether or not images instead of FEN/PGN are allowed gives examples of where images are useful, all of which involve chess positions. What is a “meaningful alt text” for a chess position?
Does this question have a good answer, or do we need to rethink our policy on images?