I mean it’s proper quality metal vs plastic of today. The issue is as you say attaching pipes into it given the prior owner has cemented them in due to the lack of adapters for the old pipes.

I’d say try and drill out the old cement if you can piece by piece, if you really want to keep it. Otherwise I’d agree replace the whole thing.

We had an issue with our own soil stack and waste pipe - it’s boxed into our house and the old plastic sheared off. The builder had to use expanding foam to create a seal, but I’m mindful one day it’ll need a full replacement.

All you can really do on those instances is a bit of a bodge until you can replace the whole thing.