The mystery is that iron will rust if wet. The care instructions are “don’t leave it wet for a long time”.
Even if it does rust accidentally, can’t you just scrape or buff out the rust and then reseal/reseason it again and it’s fine?
Yeah, but it’s a lot faster to dry it after use/cleaning.
Unless there is a literal hole rusted through it, grab some sand paper and sand the rust off of it. It’s just iron. I’ve done it many times to rescue an old skillet or Dutch Oven.
Short of taking a sledgehammer to it, it’s nigh on impossible to destroy cast iron cooking pans.
Okay but this one time I did exactly that thing I’m not supposed to and exactly what was expected happened so obviously cast iron bad?
Once my colleague’s dad threw gasoline on a fire and got 3rd degree burns, so oxygen is bad.