There are two benefits, both related to keys: 1. Key generation using tiles as proposed is truly random, not susceptible to attacks on a PRNG. 2. The key is n

There are two benefits, both related to keys: 1. Key generation using tiles as proposed is truly random, not susceptible to attacks on a PRNG. 2. The key is never connected to any network in any way--it's effectively airgapped. This removes whole classes of key-stealing and side channel attacks. That said, while real randomness is still uncommon, there are electronic solutions, and the benefits of networking generally outweigh the security risk for most use cases.