Other people covered under ADA who might agree: partially sighted/blind people (yes there's screen readers and such but a piece of paper is often simpler to handle), people with reduced mobility or tremors in their hands, and probably more.

My vision has gotten pretty bad the past couple years (not correctable with lenses)... I'm now using a 45" display and still have to zoom in a bit. I have my phone close to maxed out on text/display size options.. and only then it becomes unusable in most apps if I move the slider to the final position...

While I can use my phone for a lot of things, some UX with the larger text/display settings is absolutely unusable... so many modal dialogs where the buttons are off-screen and cannot be pressed, for example.

I can understand a small group/org not going through the effort in a lot of places... but for multi-billion dollar organizations, corporations and large govt entities, there's really no excuse.