Moreover, if you prioritize speed along with security,
An asset will only be "safe" if it is under your own control for long term storage, CEX is only recommended for active trading.
CEXs execute transactions much faster. In my opinion, the concerns about CEXs can be addressed if they comply with regulatory bodies. Once they do so, everything should return to normal.
Yes, more precisely executing the order, but for their withdrawal it may take longer if suddenly they ask you for additional verification requirements.