My lived experience. Maybe bloated isn’t the right word, but attention to performance just isn’t there. Try using any swift UI app on iPhone or Mac. Try resizing a swift UI app window on Mac.
Yeah, it's not bloated, there are just a lot of surprising and weird performance holes, especially on macOS. Even on iOS there's dumb things like, if your List cell's outer view isn't a specific type, List won't optimize for cell reuse, and it will start dequeuing cells for every item in the List eagerly. Wrap your actual cell type with a VStack or something and it will work properly, only dequeuing visible cells. It can be really nice to work with, but man, some of the implicit behavior, performance other otherwise, is shocking.