1. Uncertainty of technology implementation
Conflict fallback cost: In the optimistic parallel model, if the transaction conflict rate is too high, the re-execution mechanism may lead to resource waste and affect the actual throughput.
Mainnet performance verification: There may be a gap between the testnet TPS data and the mainnet (for example, the Solana testnet once reached 50k TPS, while the mainnet only had 1k TPS). It is necessary to observe the actual performance after the mainnet is launched.