Pheryll
Set Designer
I already gave the following message to @Ælfwine.
He replied but did not discuss any of the details.
It looks like this is as official as it gets until things get better internally sorted out.
The descriptor of "multiple sets" seems a little odd due to its functionality. As Tedious' example shows, one can chain set buildings in an A-B-A-etc. connection and all of them would benefit from a single road even if the link bonus would be redundant in various links of the chain. The end result is that you could have the equivalent of multiple sets linked together so long as any A-A connections would have a pathway around to make them A-B-A.
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[Your description] may well be the intent, but it is not remotely working as described. This description appears to be just a repackaging of the FoE system, which, I am told, will give all set buildings full bonus if they are all connected. This is why you have described the second B as only giving a single production, when it is unclear how B is actually linked in (A-B and B-C could form separate sets). Here in Elvenar, the implementation looks at each link, and gives bonuses based on the link- not on how "complete" the full set is. This is why people have pursued duplicate buildings. They cannot get the full bonus for more than one easter set building without having duplicates to ensure that links to one event building are also all accounted for on another.
He replied but did not discuss any of the details.
I was not commenting on functionality or anything else, I was simply confirming for players how Set Buildings are intended to work at this time to try to cut down on some of the confusion after the update. If they are not working as intended, then we will certainly look in to those cases as we see them
It looks like this is as official as it gets until things get better internally sorted out.