Because the ui of a website or program is not just an interface, it's also (and quite often primarily) presentation. Visual presentation is a justifiably complex field with a rich history that has taught us that how you present information is often just as important as the information itself. All those colors, animations, etc are an integral part of expressing authorial intent that goes far beyond simple branding.
Arguing that computer ux should solely be driven by the needs of interface without concern for presentation is like arguing that all print media should look like unillustrated pages from a research paper.
What's the purpose of a presentation, and why can't it just be generated?
If colors and animations convey meaning, there's no reason not to include them in the generated UI.
I have used many aggregators that let me use features from a handful of services, and never have I missed the diversity of presentations of all the base services.
> Arguing that computer ux should solely be driven by the needs of interface without concern for presentation is like arguing that all print media should look like unillustrated pages from a research paper.
Unless I don't understand your definition of presentation correctly, and ignoring the absurd idea of avoiding illustrations in a research paper, I don't see a problem with this.
Arguing that computer ux should solely be driven by the needs of interface without concern for presentation is like arguing that all print media should look like unillustrated pages from a research paper.