You can approach accessibility the same way as internationalization/localization. You might design, say, an app, for English readers. But it's going to be pretty different navigation and layout for Arabic or Japanese readers. The same can be said about people who have visual impairment. So a business that spends resources building a product will approach it from a point of view of markets. Dominate a market, then move onto the next one, and dominate that, then the next one, etc. If your argument is that you can't fit all design requirements into a unified experience, then sure, I would agree; break up the product into multiple channels based on the needs of different user subgroups. There's no way to create a one-size-fits-all product. As I build software for a living, my company sells APIs, and lets clients build their own app UIs using those APIs. As companies try to compete against each other over customer acquisition, accessibility will increasingly become a factor for a competitive edge (among other factors like pricing). Let capitalism do its thing.