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I am interested too but I can't tell the good advice from the bad.
What is 'old copper' and 'new copper'?
I've got a house that is > 100 years old. Has some copper but mostly fitted steel pipe and it seems to be fine (isolators at the joints). My newer house is ~50 years old and had a 4" copper sewer pipe through a ceiling that sprung a drip. The entire bottom of that pipe was thin like tin foil. So I guess there was a time when it was ok to use copper for a sewer pipe? Makes me think there's no sense to construction science.
I've seen a bunch of in floor heating products get released with fanfare and then discontinued and no support after 20 years because the parts fell apart.
But that plastic pipe is still like new...
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