No, lack of any options is indicative of ablism: "I can choose the right font for everybody! Or at least, everybody who matters." It's arrogance. You don't know what my vision requirements are, and you don't give a shit: if I'm not just like you, you don't want me as a customer. When you don't provide even the most common tools to help people make your app accessible to them, you step over the line of "choosing your demographic" and into discrimination.

We don't tolerate buildings that choose to focus only on the able bodied: "this is a stairs-only building; if that doesn't fit your needs, find a different building." Not acceptable. Nor is it acceptable in software, when there are easy accessibility options possible.

It's true that software has tended toward the kitchen sink in order to avoid having to define workflows. It's true that this is changing, and that's good.

But having literally NO options in something with four workflows in it? That's a stupid marketing gimmick AT BEST and a lack of compassion, competence, or empathy at worst.

I would have been much more interested in the app if you'd said it had "very few" options. But saying it has NO options sets off so many design alarm bells that I won't bother with it.

(And yes, many people need to use specialized fonts to read - not just extra-large ones, either. It's an interesting thing to research next time you're procrastinating from writing.)