There's nothing wrong with plastic.
It's the people that think they know how to use it that's the problem.
If the stiffening sleeve is used and pipe is pushed in as far as the manufacturer intended there won't be any failures.

The difference between copper and plastic is, mess up the joint on copper and it will start with a slight leak and develop into a major leak over a long time.
Mess the joint up on plastic and you get a sudden catastrophic failure.

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