Have a status bar which shows in percentage (or count) how much that is left when creating an extract.
When creating an extract it is sometimes frustrating to not know how much of the extract that is complete and how much that is left to build by Tableau. It would be nice to see in percentage/count of rows/time left or whatever how much that is complete, wouldnt it?
Potential problem with the idea:
I guess Tableau have to do a count(*) to be able to know how many rows that the extract will include. Off course, that query in itself will take time and the building of the extract will take longer to execute. On the other hand - it could be worth it.