I think it's easy to confuse what people are worried about. Getting the third grand prize was not especially hard. Getting the third grand prize, while also getting the daily prizes that make a complete set, was quite difficult, and relied on unusually good luck or buying essences.
Also the fact that unlike the FoE sets, you also needed to get 2x of at least one of the offered daily special set buildings to claim the full bonus for just the 3 main 'grand prize' buildings, making things even harder...
Again, I really think part of Inno's thinking with our initial set buildings has been, "how do we not up and destroy any semblance of balance?"
However, they've gone and swung the pendulum from one extreme to the other here... Elvenar's sets are 'moderate' to 'decent' depending on your chapter, but are nearly impossible to obtain AND are always faced with 1 or more buildings losing out on bonuses.
Conversely, 2/3 of FoE's sets are 'disgustingly powerful' for their size-vs-benefits, and are only becoming even more stupidly over powered now that they're introducing Lv1 --> Lv2 upgrading!
Only hope for this year's Phoenix set is that we get the Lv upgrading ported over, and ALL of this year's buildings get offered at some point as a daily prize in next year's Spring event...
At least that way, there could be a chance for many of us unlucky ones to finish off their incomplete sets?!