I don't doubt your experience, I can only provide mine. I've seen one rollout from the inside (~1000 engineers), performed one rollout myself (100-1000 engineer

I don't doubt your experience, I can only provide mine. I've seen one rollout from the inside (~1000 engineers), performed one rollout myself (100-1000 engineers), and talked to ~10 other companies trying to do their own rollouts (100-1000 engineers). Everyone has their own unique circumstances, and I can only speak for what I have seen myself (first or second hand)