This whole thing seems way out of line with the spirit of the "don't reset my hard-earned ratings" feature as announced at WWDC. That seemed like a great idea: Release a new version but hold on to your ratings (and review?) history.
I guess we still have that capability going forward, but what happened on 9/19/17 is not helpful at all — stripping away ratings for prior versions? Ouch. And the reviews for prior versions are completely gone in the iOS 10 App Store. I understand users are moving away from iOS 10, but many are there at the moment.
Also, what's with the odd assortment of reviews showing up in the iOS 11 App Store? In the case of my app, they're not the most recent reviews. Some are not even for the most recent version. (I'm not alone here; search "app store reviews" on Twitter).