I see what you are saying regarding artboard view.
But is it necessary? Can't the artboard be visualized in a better way?
If such high-level view is desired, won't rasterized details be sufficient till one zooms in?
"Can't the artboard be visualized in a better way?" It absolutely can! Caching and optimizations in a zoomed out view are a core part to many design tools today. These are doable when you control the whole stack of how these elements are rendered. Penpot may have to be more clever here though as they rely on the browser to render native elements.