This is the review audit feature. It was added in response to people (or scripts) mindlessly clicking "No change needed" or "Close ..." or whatever (just to get badges, for example). You could easily block the behavior if they always clicked the same button, but if they had their script click the buttons available randomly, it would be impossible to distinguish this from normal user behavior.
That's why the audits were added. It's like a CAPTCHA. It strongly discourages users seeking to get a cheap gold badge in an automated way from harming the system by answering randomly, when they should be making educated judgments instead.
It's unlikely to be removed since the need for it was identified and it was implemented to stop bad behavior.
Putting aside the scripting issue for a moment: it also prevents people from manually, repeatedly, making poor decisions when they are processing the review queue. From the perspective of SE, there is no reason to think that, just because someone has very high rep, they are automatically trustworthy, and will always make good decisions. For instance, they could get drunk and go on SE, and in their drunken stupor they might think that voting to close every question in the close queue would be a good idea. The review audit will catch them.
The only people SE really trusts more than a typical user are diamond moderators. Everyone else gets more "permissions", but there are still checks and balances in place to make sure those privileges aren't abused. It's much more difficult for SE to automatically stop a bad diamond moderator; that kind of situation is usually handled manually (which is fine because there aren't a great many of them, but there are thousands of people with 10k+).