Questions about current PoC implementation details on roles

[plebhash]

Overall, currently the roles crates are PoCs that were written with the following goals:

• test the low-level libraries under protocols
• showcase that the SV2 spec does work in practice

Those crates will be eventually refactored to a production-ready state, as detailed under #1069

Here, this Discussion is meant to be a place to do Q&A on the current PoC implementation details of roles.