I have slightly impaired vision, so I need a 30pt font to be able to read comfortably, and the web is already a disaster in terms of accessibility. There are lots of sites that I cannot use, because of overlapping content, unreadable text, hidden buttons, etc.
Same here. The web of 1996 was very accommodating to people (like me) who can read from screens, but need or strongly prefer a larger-than-normal text size, the web of 2018 vastly less so. Some developments that made things harder for me were:
Mobile Safari's decision not to reflow the paragraphs when the user does the inverse of the pinch gesture ("zoom"?), which seems to have encouraged the makers of the other browsers to give less priority to reflow even though they did not completely give up on it; at large text sizes, that decision required the user to scroll horizontally left and right for every line of text;
Google's purchase of Blogger followed by its changing Blogger so it will not show the reader any text unless Javascript is enabled, which seems to have encouraged other sites to do the same; this made it impossible for me to continue to visit those sites in Lynx (a browser that ran inside a terminal window, but did not support Javascript);
HTML5 in general was a disaster for me. For example, at large text sizes, the elements that remain at a fixed position relative to the window regularly end up taking up most of the window's real estate, leaving little room for the text I want to read.
Clarification: those have been my frustrations when trying to read what is or easily could have been static content; this comment is not about web apps.
Reader view often excludes figures that are important for understanding a text, so this unfortunately is not an option for me.
I have set my font size to 32pt and do not allow web sites to use smaller fonts or typefaces other than my preferred one. Also, I have set text color to green on black, which is easiest to read for me. You would not believe how many web sites do change background color, but do not set text color, leaving me with bright-green on white text. :/
Then, a large font causes components to overlap, rendering text and buttons inaccessible. Disabling style sheets does not always help, either (and turns every modern web site into a complete mess). Semantic web? LOL.
Javascript, as others mentioned, is a huge problem, because it somehow seems to be able to bypass my font and color settings. I have it turned off all the time now and just do not visit sites that require it. Well, more time for more interesting things! A silver lining in every cloud! :)
