As far as iOS is concerned, for years, until iOS 7, the primary function of the Update tab has always been to see what needs to be updated. That is how it is in Windows Phone, OS X (at least until Mavericks), Windows Update, and how it is on most other update systems as well.I'm not opposed to a choice to clear the listing at all but I just don't see the point in separating them now as the primary function of the Updates tab is to see what has already been updated rather than to see what needs updated.
I don't even get a notification badge on the App Store now about pending updates, it just does them...and I only know they are done as it appears in the NC. After that I can go to Updates to see the changes.
When I *do* catch updates in the App Store before they're applied they have a "Update" button next to them which seems enough of a differentiator.
Now, with the introduction of automatic updates (which, by far, not even close to everyone will actually use or even want to use) having a list of recently updated apps becomes that much more useful and important, but that doesn't really mean the whole purpose of the Update tab suddenly changes from what's available to update to what was already updated. It's clear the two need to coexist due the new features that are introduced, but there are better ways that it can be accomplished rather than simply taking over the already existing tab with known and previously established (for a long time) functionality and almost repurposing it for something else, or at the very least sort of throwing multiple things into a single pile.