It would be great if we could extrude 2D text/paths/shapes to give them depth in WorldSpace UIs with just a few additional XAML properties.

This would allow developers to create 3D Text, 3D Buttons and other 3D UI elements very easily.

Unreal does something similar with their 3D Text Plugin. With just a few properties (extrude, bevel, bevel type, Half Circle Segments) you can create 3D Geometry from 2D Text.
Docs: https://docs.unrealengine.com/4.27/en-US/Basics/Actors/3DText/
Source: https://github.com/EpicGames/UnrealEngine/tree/release/Engine/Plugins/Experimental/Text3D/Source/Text3D
Video Example 1: https://www.youtube.com/watch?v=YD4th9T3Kfs
Video Example 2: https://www.youtube.com/watch?v=r_PdMTN5oKk
Video Example 3: https://www.youtube.com/watch?v=4cJbOZAfnIc