Why use regular @ 2x and @ 3x size images on iPhone when you can only use @ 3x and set limits on different size classes?

Question

I am just confused by this topic.

Answer 1

Resizing images has several costs, including:

Image scaling is an imperfect process. A 3x image scalable to a density of 1x pixels may have visual artifacts or are unable to effectively transfer its goals to the user.

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