I agree to an extent, i.e. the C.I. will be robust, especially when taking any knocks at ground level. It's a double edged sword though as any future works can be a pain with the C.I. I replaced mine (as well as modernised all the drains) and it was the best decision we made, as there have been numerous additions to the new stack.
It just means connecting to them in the future is much easier. I've seen instances where a section has been cut out of the C.I. and a piece of plastic grafted in with a pair of ugly Ferncos, so that connections can be made. Not the best look.
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