I just sanded a skillet today and though I'd add my thoughts to the hive mind.
I've cooked in cast iron since I was frying eggs in my dad's skillet at age 8 or so. I've also cooked in stainless, nonsticks of various chemistry, and carbon steel. Briefly had a copper comale too. I use all of them now depending on my mood and what technique I'm going for. I have handled most of the cooking in my marriage for going on 11 years, and in the past 3-4 have done 99% of it. I cook daily, and it almost always involves a skillet.
IMO, Seasoning is malarkey. Hogwash. BS. Nonsense. Navel gazing. The result of too much free time and access to the internet. It's not magic. It's not hard. You don't have to "learn the ways of the iron." It doesn't matter what fat you use. You don't have to bake it repeatedly.
Why do I say that? Because I've cooked in stainless steel, which is just naked metal with no seasoning, and stuff doesn't stick if you keep it clean and preheat it and use a little oil.
I am literally eating lunch right now. I fried two eggs in a skillet and am eating them over rice. They were fried in a 10" cast iron pan that I just sanded, progressing from 80-220 grit to make a fairly smooth surface. Washed it until a paper towel didn't stain and cooked in it. ABSOLUTELY ZERO SEASONING. I preheated the pan for 5-7 minutes while I warmed up my rice, made a cup of coffee, and got my eggs out of the fridge. I threw a small dab of butter in there. I cracked the eggs in the pan, and...they didn't stick. No real difference in food stickability between it and my PFAS pan. Because the pan was clean, smooth, preheated, and I had a (small) amount of oil.
A clean pan that doesn't have residual grease cooked onto it or rust on the surface, that is preheated, and lightly oiled, is not going to stick in a meaningful way whether it's made of iron or steel or copper. A dirty/rusty pan, or a cold pan, or a completely oil free pan...is probably going to stick.
IMO, oiling or "seasoning" a pan should be thought of more in terms of oiling a knife than trying to build some kind of PFAS-free, magically nonstick coating. I scrub and dry my pans after use, and keep a level of oil on them comparable to what I try to keep on a knife or firearm or other tool. Clean it, dry it, wipe some oil on, wipe it off. It should look a little shiny and feel not-dry, but not make your fingers oily. This is mainly to prevent rust, which will make a pan that can oxidize (cast iron or carbon steel) stick.
Smooth and clean, enough oil to flavor whatever you're cooking without making it greasy, and a proper preheat is the key to practical nonstick cooking. I may not be able to slide my eggs around like they're on ice, but that's performative cooking for instagram, not feeding the chilluns. You're never going to make cast iron as nonstick as something using PFAS, but you can cook whatever you want in it and not have it turn into a forsaken mess that needs to be soaked in the sink.