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pvc drainage fittings were not available in some western states for whatever reason. Lately I see both Pvc and Abs fittings at suppliers.
One step glue is nice for ABS, but the pipe really warps in the sun, on the truck in a sub-rough outside.

Both cellular core PVC and Abs are more fragile. I always buy solid core pvc pipe

By the way, love the avatar! Mad Dog

Hi, I'm out West, so I like the cast iron stack (to help with keeping it quiet) and ABS for the rest. 🤠

Yours, Larry

that is leaking because the steel pipe rotted out. you could probably just replace the steel to the cast iron with pvc or copper.

the steel pipe gets rough on the inside as it rusts and clogs easily. i rarely see clogs in the trap, it is usually further in the laterals from the wall/floor to the stack or under the floor or in popup or tub drain assemblies.

The cast iron is fine. Lose the galvanized going into it and replace that with copper.

Galvanized drains are the worst IMO.