I'm fully on the cast iron train but it definitely heats less evenly. Nothing 1-2 minutes pre-heating can't solve, though. That said, as you mentioned, it will hold temperature a lot better.
Ah, maybe I was confusing the two effects. Good explanation, thanks. I guess holding the temperature better makes it feel like it heats more evenly, but only after it's well preheated. It's definitely my goto for recipes where keeping a steady temperature despite introducing cold ingredients matters