Re: So you wrote it, and it works
"As the article states, apps "that no longer function as intended, don't follow current review guidelines, or are outdated" could already be removed under Apple's previous policy. This easily includes apps which are using outdated, less-secure APIs."
I hate to defend Apple, but under the existing rules a human has to go and look at the app, apply guidelines, work out what the app was intended to do, see if the app still works as intended, and then decide whether to kick it off or not. By applying rules like "app has been downloaded fewer than x times" and "app hasn't been updated in y years", that process can be objective and automated...
...and 98% of the stuff that will be kicked off is untended rubbish that no-one will miss anyway.