People assume that accessibility is all about some small minority of less abled people who can't "read good", but it's a broad category that affects all users. If you build following the guidelines then you end up with a quality product that can be used by people who stumbled upon it while doom-scrolling instead of enjoying their beach vacation. The best analogy I heard was about drop-kerbs/curb-cuts... people wonder why we're catering for a small minority of wheelchair users everywhere and then they have a kid (or wheel luggage from the airport) and realize how great they are.