It looks like among the daily prizes we have pieces of the 3 Glacier Giants set. [...] maybe we get some more of the old sets offered like that
I'd say that you can be sure of it. That usually happens when mature games like this realise that recycling old content is cheaper than designing new (the Event Characters also spring to mind - not that I'm objecting; just observing)... and most current players weren't here back then, so they often think it IS new...
Unfortunately Inno has apparently also realised that nerfing old Event Buildings is a possible option, too - e.g. the Wonky Walter's Circus Tent (not badly nerfed, but it was) - I haven't heard anyone on Beta saying the same of the Winter Set pieces, though...
Oh, and Wonky Walter's is now a standard Mandatory Chapter Quest reward for early Cities, too. Interesting... some small Cities have two now!
or even a Gingerbread Tome for the base building. I deleted mine as it was early chapter. I was under the impression [...] it was better to delete and wait for it to appear in the MA [..] there's been no sign of it anywhere since.
The Crafting Rotation is changed more often than anyone knows, but it's significantly altered since MinMax Gamer crowd-sourced its contents, some time ago now (I always feel awkward talking about someone who's not here any longer - but I can't @ tag him because his ID has been deleted - but then again, I also feel dishonest if I don't name-credit players who have done, well, anything for the community, really! Oh well).
I myself have noticed that UUUs are now about 60-70% less frequent in appearance [for some six months now] than MMMs (most common) or ELRs (about 20% fewer than MMMs) - nothing to do with encouraging us to do more Spire and try to win DAs, of course - and Rainbow Unicorns are rarer now than Mana Sawmills by a factor of at least 1:3 (annoying for me personally - I heavily use the former and don't have any use for the latter)... while Rainbow Flower Cages, with their amazing 1x1 high-stats versatility in my ever-more-crowded City, are becoming a collector's item - maybe 5 x fewer than a year ago? Of course, I get
plenty of chances to [expensively!] Craft PPs, although I'd rather see more Supply Windfalls (growing rarer) - and Coin Rains, too, nowadays - after the huge hike in FA Coin Sacks & Event Coins Quests demands (they're now even rarer than Supplies, but were once much more common - it interests me, actually, in light of the increased Coins demands - but this is already long enough!).
And I really don't buy the 'its all totally random!' argument. No, it's not. I see almost all Crafting Rotations, and if that's Inno's RNG - it's broken.
My own experience of seeing (or not) Evolving Buildings in particular [over the last year or so] is that most of the bases apparently never appear, while a few others are over-represented, and it seems to have little, if anything, to do with whatever Artifact is currently in the Spire. Both 2019 Phoenix bases & Artifacts are [relatively] frequent, though, and I've seen Gingerbread Mansion within the last year (base only, no Artifacts)... I'm also currently seeing a few May Tree Artifacts (no base)... and although these really ARE rare, the 2019 Bear bases & Artifacts do also appear, too. Plus a few strangely random Artifacts here and there - not enough for anyone to make use of, though. I do feel sorry for the tiny new Cities I see with sad Stage 1 or max. Stage 2 bases - near-useless and HUGE as they are in Ch.1-3, just sitting pointlessly in their Cities... making fewer Supplies and/or Goods than a couple of extra Workshops/Manus would also provide, and no doubt having cost them scarce Crafting Resources to build, too. That's pretty unfair IMO - it's hard enough to get started in Elvenar.
A cynic would
almost think that they're in Crafting at least partly for that reason, especially because excluding them from (say) pre-Ch.V Cities would be a much fairer (and hardly difficult) thing to do, IMO... using up valuable early space while those tempting Premium Expansions don't look TOO expensive, or might still even be on discounted offer? no idea, now! - after all, it's a widespread belief that ALL Evolving Buildings are fab, with Facebook comments in particular often making little distinction between excellent Event Grand Prizes and ones which - aren't.
Good thing I'm not a cynic, isn't it?
PS : I have no reason, either, not to believe that some of us see different Crafting Rotations from others. Inno do a lot of silent A/B Testing now. And on top of this, I've heard - and to some extent have seen this myself, through experience - that the Crafting Rotation now adapts, to some extent, according to what each player chooses most often to Craft. O the joys of minimalistic in-game data provision & Patch/Version Notes, hm?
PPS : It would be entirely possible for Inno to offer in Crafting, post-Events, those Set pieces which players didn't win. But noooo... bah, humbug!