No, this isn’t a cast iron thing. Using stainless pans, you can get nonstick effects that, in my experience, far outperform Teflon anyway. The process is called “spot seasoning.” I have cooked crispy, cheesy rice noodles with eggs with zero sticking.
I love my cast iron pans, but stainless is my daily go-to. Added bonus: use 100% copper wool to clean your stainless pan. The copper-coated wool at most grocery stores is problematic; you might get a few uses out of the coated garbage and then it starts shedding metal bits.
But that’s how you cook an egg. Every Chinese chef does it this way no matter the pan.
The first year I lived in China a tutor of ours offered to cook eggs at a breakfast and the American girls who lived in the apartment agreed. They were horrified when she heated an inch and s half of oil and deep fried those suckers
This is the way!