I don't understand the aim of article at all, and I research NP-complete problems for a living. I am not however an expert in blockchains. Yes, sharing is NP-c

I don't understand the aim of article at all, and I research NP-complete problems for a living. I am not however an expert in blockchains. Yes, sharing is NP-complete, but that's not, as far as I understand, a problem. Efficient scheduling of parcel delivery is NP-complete, the postal service runs fine, if probably slightly suboptimally. Why does it matter if we do what everyone had always done in this type of situation, and just have everyone love in the shard they choose, moving when they feel like it?