The limitation of formats vs stores is that some stores are automatically geo-restricted. Clued-in people know that Sony at present doesn't serve anyone outside the US/Canada (and in the future, the UK) unless they lie about their address.
Also, Christian Book has online reading and occasional non-DRM ePubs, so in order to best represent the books, one would have to check the individual listings, which could get tedious. (Not to mention the name provides a content warning for those who want to auto-skip religious stuff).
And then there's places like All Romance, where there's a bunch of formats that readers can pick from, but only one at a time.
Not to mention people may specifically want a version which autodownloads/syncs with their reader, from the store said reader may be attached to, and it would be nice to let them know that X is finally also available at Sony/Kobo.
A store-added update to the thread title provides exactly that info without their having to check back to see if that comment someone made was about a new store, or just unreadably bad formatting.
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