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Applying the concepts from youtube.com/watch?v=ZdiBPH in iOS app engineering would be a massive improvement over today’s “consensus” (disaster)

Ah, gotcha. Cool! I'm worried about rendering performance (mostly just because the system is so raster)

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It is absolutely possible to define less raster-focused rendering platforms for UIs: acko.net/files/pres/sig

But I'd suggest the biggest unsolved problem is the data format describing behavior, not appearance.