a mobile web design accessibility thing that i have never seen addressed but impacts my daily life so much:
tons of websites just become unusable when you have your device's text display set to a larger size. text floats all over, button hitboxes overlap, images get pushed out of bounds etc
large text helps so much and i have it set up on both phone and tablet. but for a lot of websites the only way to get them functional is to go into desktop mode, which makes the text even tinier and i have to squint and suffer and zoom in and scroll horizontally every two words
eta: a lot of the time these websites are very important for people to be able to access, like identity document renewal info, healthcare info, nutrition and allergens info. there's ways around it, yes, but it just kind of sucks that it has to hurt or take more time to navigate these things if you have poor eyesight or migraines etc
WCAG is the baseline accessibility standard referenced by most legal frameworks. The specific success criteria I'm talking about here (Resize Text) has been around for a long time. It works alongside the Reflow success criteria to improve accessibility for low-vision users.
Web and mobile developers just continue to fail it.