Then these Bitcoin nodes (aka Bitcoin) should not truncate the chain. When you truncate up to some point you trust that you have a valid snapshot up to this time. There is no way to verify the UTXO chain (in the sense that there can be missing transactions) once the prefix is gone. So if someone manages to slip an invalid utxo into the blockchain, and this error is discovered after the prefix is gone, it invalidates every node that forgets prefixes.

So it could work as a fast-bootstrapping probably-reliable mechanism for your home PC. Something between SPV and full wallet. But to be done in full nodes the snapshot mechanism has to be incorporated in the blockchain.