What's the deal with very heavy pots?

Another concern would be the possibility of developing rust on any exposed iron (anything that isn’t enameled) if the pot sits wet/damp for long? Depends on how your dishwasher’s drying cycle works and the design of your pot.

I agree about the exposed iron. I don’t ever use the dishwasher for mine because the cycle is so long and even with the dry cycle on, it’s still a humid environment.
I wash mine by hand and dry thoroughly just in case, and its usually pretty easy to clean.
This from someone who puts absolutely everything else in the dishwasher…