@darius "Competing Access Needs" is the phrasing I've most commonly heard.

But in this case, in software/web design, they're not in competition -- they are both handled by design that allows the user to pick their own font size, for as wide a range of font sizes as possible, without breaking or without causing fundamental shifts in how interacting with the content can work.

Because the user's own set-up and own environment is part of the render loop, we don't need to try making "The One Accessible Version For All Disabled People" -- instead, we integrate into the settings provided to us and design in functional knobs and control points for customization to be fit into that environment.