Interestingly, the primary surprise in your comment is that you say that just about 20% of website are not accessible - I'd have expected that percentage to be

Interestingly, the primary surprise in your comment is that you say that just about 20% of website are not accessible - I'd have expected that percentage to be far higher! Of course, there's a difference between "usable" and "easy to use", I guess. As a note, for any sighted developers (like me) reading along: I'd highly recommend you to spend half an hour to learn and practice navigating software with a screen reader some time. It's a relatively easy step that gives you a lot of insight into low-hanging fruit in terms of accessibility improvements. (Also, keep in mind that accessibility is not just vision impairments. Things like small click targets can make things a lot harder for people with motor issues, e.g. many elderly people.)