I've heard the same thing, but mine has to be at least ten years old now and still works great. I even stepped on the cup once and had to bend it back into shape.I think they discontinued them because the welds aren't very durable.
a Toaks Ti cup and BRS stove works just as well and is 3x cheaper
There’s certainly lighter options, but I tried a number of different cups and stoves and never found anything that boiled faster or more efficiently than a JB. Not saying it can’t be done, just never had that experience myself.a Toaks Ti cup and BRS stove works just as well and is 3x cheaper