Agreed! With a gas cooker you can turn it down if you notice something boiling over and it will turn down then, not in five minutes' time when the hob's cooled down. They've improved a lot, but they're still not as good. I'm not sure why electric cookers have become standard given this. Off-topic grumble over.
Two possibly relevant pieces of information:
As somebody mentioned, at one time cauldrons weren't cast but pieced together from sheet metal. Here's a 3000-year-old example from the British Museum, TL1 or TL2.
https://www.britishmuseum.org/collec.../H_1861-0309-1
And here's a small firm in Canada that makes various cast-iron items. They have cauldrons for between $210 and $280 (100-150 GURPS dollars or thereabouts).
https://bristowironworks.ca/?s=cauldron