I've been blessed to mainly work in companies that had very high engineering bars (finance, faang) but I spent two years at a scale up and the difference in engineers was crazy. Senior engineers who, when faced with an outage just threw up their hands and said "we dunno".
And this was still a place that was large enough and tried to have a bar. I can only imagine the next tiers down (eg, where do people who can't cut it at these places go?)
I don't know how much of this is 'innate' caliber vs benefit of working along others who has high expectations and taught you (vs not)