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.