Why is PEAD better than PVC or concrete?

“PEAD offers a lifespan of over 50 years underground, is immune to corrosion, roots and acidic soils (versus 20–30 years of PVC and continuous maintenance in concrete). PEAD is 95% lighter than concrete and 60% lighter than PVC — reduces logistics cost and installation time. Resistant to acids, alkalis, oils and agricultural products.”