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.
Veritasium just released a video about teflon and it’s impacts yesterday https://youtu.be/SC2eSujzrUY tldw they say that it’s fine for non-stick pans at lower temperatures but the smoke it creates at high temperatures is where the danger is. Especially for pet birds.