I disagree with that. When you make a call to get the width of an object, whether you have resized it or not, you expect to get the current size.
Not to mention this is also how it works in flash. When you retrieve the size of a movieclip or sprite, you get the current width, not the width of the object during designer mode.
However the .getWidth() command works, I would hope to get a low level result of the objects width, not a static value.
This is not a serious issue as yes I can calculate it myself, but that is more work and this engine is intended to simplify the process, not make it more difficult.