Thanks for the comments Charles!
I found choosing what to prioritize on this topic to be very difficult. What I arrived at is that “what is most important” can only be determined by the the types content and the audience. For example, subtitles (listed as number 3) may be a number 1 most “critical” priority for a video service, but probably not even on the list for a flight tracker.
Forcing myself to stack rank order the list, I considered how most web services are visually designed. Also by the numbers, visual impairments make up one of the most common physical disabilities. A tough decision but one I think makes sense if I generalize for all product designers.
I also agree with your comment that many visually impaired people are adapting — but I beg the question, should these users need to? If I have great vision and haven’t needed to adapt, I can still benefit from the better design in contextual settings like poor lighting (or the screen glare example).
Two steps forward, now one step back…
The last thing I will mention is that mental/cognitive disabilities may actually offer the greatest opportunities that I discovered in my brief research. I was pulled away from including this due to the large variety of challenges addressing this topic. It would be very cool to do a separate study and list of design specific only to cognitive accessibility. 🤔