Neither is soldering, but people and companies solder connections all the time that look good but then come back to becoming resistive connections.
It's a plumbing thread and I made a comment about plumbing. If you see that as shit because I know more than most here about plumbing, then so be it.
No, I only say that about plastic because one of my best friends is a PhD scientist doing research in polymers (plastics) for the US Army and I happen to know that plastics AGE. I can find a piece of copper laying out on the ground that has been there unchanged in millions of years; take a piece of plastic and lay it out on the ground for TEN years and see what you find.
You're like the defensive plumber who upon being faced with legitimate critiques for the convenience materials he uses has to resort to personal attacks as a deflection.
Just ask yourself what a person building a 50 million dollar new home with no budget constraints uses. Hey, I never attacked you for using PEX or PVC Gramps, I just said I wouldn't use it myself. And about that newer type of PVC, they use it now because they found so many problems with the original PVC. By introducing chlorine gas to the PVC, it replaces some of the hydrogen atoms in the poly chains making the tubing more compliant and durable. It extends the service life of the tubing because older PVC was failing so much.
All the CPVC does is bring plastic tubing into the realm of reliability for long term use in plumbing. No such issue with copper.