Copy and paste - it would be nice to have to option to copy cell including formula and format and then paste this cell to another cell.
Some times instead of reentering data, formulas, relations, or formating elements, you could just copy (or cut) and paste from one place in spreadsheet to another. This is well understood and an original feature of many software apps including excel of times ago. It seems that this has been removed from the current release of excel 16.10. It might be something to bring back.