The minimum configuration: when is a workflow template "valid"?

A workflow template is only fully usable in this app once at least these criteria are met:

Active = Yes (the template must be active)
Primary Table is set
Rule Set exists (is created/updated automatically when the primary table is set)
At least one normal step (Step Type = Normal) exists
At least one workflow trigger exists and is active

When you activate the template, the app runs a validation and shows an error list if necessary.