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When you have composition being driven by information that you can only get in a later phase, like measurement, layout or drawing, the first composition can't be correct! This means that the first frame might be blank, or components might jump around as you get more info.

Nesting this approach makes the situation even worse - each time you put a calculation like this inside another one, it adds an additional frame required to resolve the whole layout.

This can also wreck havoc on animations - maybe they can cover up some of the jankiness, but animations need to have a consistent view of the layout as it animates at each point in time. Shared element transitions don't really work if the shared element disappears completely for a frame.