Pretty much yes, It's more about organizing them.
I want to have same structure on more than one site, so when the structure changes on one site, I have to change it on all sites, right now I have over 50 categories to modify on 7 different sites, so it would be much easier for me to delete them all and then add them back the way I want.
That would be very helpful if it could be done both with "tags" and "custom taxonomies"
As long as taxonomy structure could be:
1. bulk copy/pasted
2. bulk deleted
3. bulk edited in any text editor
4. bulk added back to all sites
5. Keep the txt file for taxonomy structure backup
,then the import/export tool would NOT be so necessary, and it would be still missing bulk delete.