default should be blocked; it was used in completely unrelated questions about a default value, such as:
- Setting default image style to 'original image' in formatter
- Default values help (The question is about a default image.)
- Default date field values like "today +10 hours 30 minutes"
value was used in unrelated questions, such as the following ones:
- How to display image instead of a value in Drupal 7?
- Token replacement for list keys
- How to list and store the value of hidden exposed filter of several views for anonymous user?
- Output view field as link
Both the tags are too generic to be really helpful; the answer for a question doesn't change, if one of those tags is used.