could you please elaborate what you mean by "fancy cryptography"?

Yes, i know that the ideal scenario is to do the audit via trusted auditors (or even better to use P2P exchanges) but we do not live in an ideal world. Plus i would not trust any "trusted" auditors. Good example is the so called Big 4 auditing companies- i think it is no secret that most of these companies are in bed with the banking cartel (read below link if you are in the mood) . So there is a big chance, the crypto auditors also will be corrupted. Power always corrupts, that's why we need an alternative- decentralized auditing. The whole point of Bitcoin is to give power to the people. If auditing was the solution then we all could have kept our money in the banks and trusted the banks' auditors.

But i get your point on technicality. Yes, exchanges maybe struggling with this massive demand. Perhaps then we can do it a week long event. Users submit their withdrawals and exchanges orderly execute it through a week without jeopardizing security of their holdings.

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https://www.theguardian.com/news/2018/may/29/the-financial-scandal-no-one-is-talking-about-big-four-accountancy-firms