I suppose I understand the idea of the pets in the support sets being weaker than pets in primary sets, but since the power's active duration and cooldown are the same value, the DS can be re-activated the moment it despawns, which makes them practically permanent, assuming you don't just forget to respawn them for a few seconds. If I can immediately respawn the pet, what's the point of it expiring? Are there other powers where the active effect and the cooldown are the same value?
Also, it's wild that my memories of this pet not despawning are so vivid and yet clearly wrong. Sucks to get old.