Can you elaborate?

The platforms/frameworks I use, like WPF, don’t use screenshots when animating changes to whole-scene content replacements.

(Not saying WPF is good overall either, because it isn’t; but despite it being almost 20 years old now there’s still times when it makes me go “oh, neat”)

This isn't my experience on iOS / Mac OS. I'm used to seeing videos and animations continue running as they shrink and slide around (IIRC, thanks to CoreAnimation being designed to support exactly this from the outset). The occasions where they pause feel like the exception to the norm.