Hard to make a decent topic title but the explanation will improve this
What i miss sometimes is the possibility to keep the body you have just removed by shelling something.
For instance, you could have designed a duct but as a complete solid.
Later on you want to shell that duct so you'd have a correct weight but ofcourse now you still don't know what the volume is in this duct.
If you'd have the option to split up the duct into two parts (Shelled result and the shelled part that has been deleted) you'd be able to have the volume immediatly.
This also could be applied for concrete castings (volume of the amount of concrete), or liquid substances ... etc.
Happy to hear all of your thoughts!
Cheers!