I wouldn't take the 2CV as an example of suspension that modern cars don't match, but Citroën's later hydropneumatic suspension[1] are indeed unmatched.

[1]: https://www.youtube.com/watch?v=HKyWKKs4ISo

>Citroën's later hydropneumatic suspension[1] are indeed unmatched

Yes, and ask yourself why they aren't making it anymore. Answer: cost and reliability, which is also a function of cost.