But this would definitely not be a model default ;)
I think perhaps we may find value in separating Impact from other tags & this would be one such differentiator.
Others would be in linking Impacts to Needs, etc...really hard if some tags are Impacts & some are not...we'd want to start adding a tag for the tags ;) We /could/ use Comments for that but this is a poor man's version...I think Impact is sufficiently required an idea that it should be separated out.