What's the main value proposition of roc? I found interesting tags (like symbols in mathematica) and tags with payloads (like python namedtuple or dataclasses).

What's the main value proposition of roc? I found interesting tags (like symbols in mathematica) and tags with payloads (like python namedtuple or dataclasses). I haven't seen this elsewhere. Otherwise seems quite typical (Pattern matching is quite common, for example). Example programs that you couldn't easily express in other languages?