Cool to see but not very functional. Let’s take a look a two different styles.
American Style with attached lid.
Irish style with detachable lid.
Cast iron kettles are very difficult to clean which leaves them useless for anything but “Steaming” a room. You can do the same thing with a pot (Which can be cleaned).
One thing they are good for is making a profit! If you buy it right you can flip it for double your money.
Have a great day All! & Enjoy your cast iron cookware, some of it is very useful.