To me, it feels like the Activity Types should have been past-tense verbs, rather than present-tense verbs.
I.e.:
• "Accepted" rather than "Accept"
• "Added" rather than "Add"
• "Announced" rather than "Announce"
• "Arrived" rather than "Arrive"
• "Blocked" rather than "Block"
• "Created" rather than "Create"
• etc
Present-tense verbs feel like commands.
Past-tense verbs feel like events.
Activities are events not commands.
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