My Mother had an English 'Hawkins'-brand 10 pint cast-iron P/C, bough in 1947, which she used constantly.
She taught me how to use it PROPERLY, & I continue to use it to this day.. The rubber-rim seals just need replacing every ten years' approx dependent on usage.
It's THE best appliance in which to cook Corned Silverside, or Soups.
Recipes TBA, if you request!
Neither my Mother, nor I had/have had any problems with it at all. There's a routine with it, which I strictly follow.
As I've no need to buy one of the 'modern' appliances, I don't know their workings.
The spate of accidents of late with 'Thermomix', & another P/C, leads me to wonder if the persons' were using them correctly.
Like anything, use it the wrong way, & things 'do happen'.