The new facility to update CMS items by import is very welcome but it doesn't go far enough. You can replace the contents of a field. Or for multi-refs you can add extra items or delete from many down to one. This is great.
BUT if you want to empty a field, you can't do this via import.
I discovered this yesterday when blank cells in my import did not overwrite the existing field cell contents. I ended up doing the job manually which was rather a waste of time. (yes I know you can delete the item and reimport as new but that gives you a new item ID and perhaps has other consequences, so I am wary of doing that).
I would like to be able to empty a field via import.