Not necessarily. You design your data model to prioritize (1) correctness and (2) performance. It doesn't have to resemble the UI at all, as long as the UI can fit on top of it with some abstractions.

Some examples that come to mind: - video games with their entity-component systems; - high-performance text editors like VS Code. [1]

[1] https://code.visualstudio.com/blogs/2018/03/23/text-buffer-r...