In excel the status bar displays sum, average and count simultaneously, so it's very convinient for quick checks. In calc only one of the three can be shown at a time. There are several request for this on the web, so I think a lot of users, specially those coming frome excel would appreciate this feature.
Yup, I miss this sometimes too..
and it's implemented too - with some little debate to be finished
*** This bug has been marked as a duplicate of bug 42629 ***