Town Puzzles Repetition

First of all I searched and didn't find this in any thread so, apologies if it was already posted.  Why can we get more than 1 garden, tesla, tiles or candy puzzles in our domains? On the other hand  I have a thorn patch on 3 of my towns and roads of rome on almost every town at Luminary. I consider those also puzzles to some extend. So do not understand why some puzzles repeat at domains yet  others don't.Another thing I don't understand is why is the hero needed every time to do the candy puzzle? Hero is not needed frequently for other puzzles so why for this one? Maybe the dialog can be modified some so that the hero is not required there for every level? I mostly get this puzzle at my dwelling and hero is hardly ever there.Just some thoughts  on the puzzles which I enjoy very much and hope we didn't have to wait soooooo long in between levels :) 

Along the same lines, you only have 1 chance for the garden, Tesla , apocalypse and some others.   if they show up in a town that is destroyed, you can never get them again in any other town.   I understand not being able to have 2 of them  but could we have a second chance to get one of them in a future town if we have had the original one destroyed?

I understand not been able to get a repeat puzzle in our towns, but maybe can we have a decrease on the times that the hero need to talk to the candy Wonka?  Talking to him every level is a bit much, imo.