Binance Smart Chain is an innovative solution to bring programmability and interoperability to Binance Chain. Binance Smart Chain relies on a system of 21 validators with Proof of Staked Authority (PoSA) consensus that can support short block time and lower fees.
The Binance Smart Chain also supports EVM-compatible smart contracts and protocols. Cross-chain transfer and other communication are possible due to native support of interoperability. Binance DEX remains a liquid venue of the exchange of assets on both chains.
Mainnet updates are mandatory as it enhances security to the network and improves overall performance of your wallet. It improves the security, speed, performance and moreover it will ensure that you are on the right chain id.