Auto size for the width of a control is very useful.
I would find the ability to auto size the height of a control to be equally useful. Especially for text, grids, text area, and lists. (But it would be great for any element that can vary in size with multiple “rows” of content.)
I find that using the text control is fiddly compared to the label control. The text control requires careful adjustment to size it correctly. I would love to be able to auto size the height and have it fit the contents vertically. This would be especially helpful when I change the content and the height needs to change with it.