I think the error messages should highlight (point to) the bad part on the plan. What good is the error message if you don't know which element it is. At least if it's highlighted you can delete and replace.
I voted essential.
It would be superb to have instant on-screen reply. Error messages can become a handy and comprehensive tool within ArchiCAD instead of ...
Big improvement of BIM software today. Let's get interactive with the 3D model!
