Allow full functionality with shared workbooks.
With the shared worked book i would like to see if i can now merged and actually change things besides just adding rows and columns. i would like to merge,and cells and etc while also tracking what someone else is doing in the same workbook. Same goes for excel online, i like to track what the other person on the workbook is doing.
Paul Nelson commented
Shared workbooks are great, but the amount of features in VBa Macros that will not work once the workbook is shared makes them relatively useless. Also, once the workbook is shared and the Macro blows up, the debugger does not work, making troubleshooting VERY complicated.