These are some of our top tags which look like they need more/better guidance in the tag wiki excerpt:
Altered sounds like there is a certain ownership to it. Anyone with editing privileges can take part in shaping up a tag wiki. So the correct question to ask the community and your fellow users is whether tag usage should be included in the tag wiki.
There are a handful of redundant phrases - including some containing the name of the tag itself - that are not displayed on tags list, to help ensure there's room for the non-redundant parts of the tag excerpt.
The google spreadsheets tag wiki doesn't match any of these, so it's displayed in full.
For details, see: New tags page mangles tag wiki excerpts