We're updating the status of this idea to more accurately reflect its current status with our engineering team, and also made slight changes to the subject line in order for it to be more easily found. We can't guarantee a commitment to deliver on this feature request, but it should indicate some awareness that we have heard your feedback and could be taken under consideration for a future release.
In the meantime, you can still accomplish this in a couple different ways.
Use segmentation. Your setup will be Tags > Not tagged with > and then select a tag. You'll use +AND, then repeat the process for each individual tag you have, then save the segment. Once it's done processing, you'll have the contacts that don't have any of the tags applied. This segment can then be added to a new list for manging the contacts, applying tags, etc.
Export all of your contacts, then use your preferred spreadsheet program to sort the contacts based on their tags column. Add tags to the contacts with empty cells for the tags column, then re-import the contacts with their updated tags.
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