I can't see any meaningful difference between the branding and sharepoint-branding tags. Should they be merged? Or is there a difference I'm missing? If there is a difference, then their tag wikis should probably be updated to highlight that difference.
Yes, there is no real difference here. I've merged the terms. Thanks for bringing it up. There is a way to propose a merge. If you click on Tags, then click on the specific tag, there should be an option for merge. This will lead you to a page where you can supply what the desired term should be. It'll then be available for moderator review.