> If human SREs (okay, now we have to use adjectives like human ) only engage with Tier 3 incidents, i.e. the novel, never-before-seen outages, where do they build the intuition to handle them?

Ime this doesn't happen or reflect the reality of work. I had one mythical job where I wasn't directly on call and only received escalations and didn't have a problem with debugging whole system issues. I still worked on the whole system day to day.

Also I feel like this post is also my frustration with sre. In people's minds it's just the job that deals with issues pumped out by swes and they have to work magic because no one else can be bothered to try at their job. This just reinforces that idea.