I wonder how long until most players are forced to use standard buildings (and many will start ignoring even big events).
Well, with mana Inno has already succeeded with this event.
If someone enters mana chapters between summer and this event, he will have to use standard buildings, because - unles Inno is hiding some usefull mana building for this event - there is no way that player can cover his mana needs from just 2x2 buildings, there's no way he can get enough of them.
My personal opinion is that constant shrinking of daily rewards is very bad idea.
Even if they have better values per square, players simply needs several times more of them to get the same bonus as from 1 big building.
And why is there no pure culture building?
Well, at least with the old chest system, we can get lots of both coin and tools instants.