Deleted User - 341074
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It would certainly be a late-game feature, but perhaps not end game. Somewhere in the early teens when real excess of all those goods is normal.Adding a new building adds a lot of new questions: how to introduce it to the game? when and where? Putting it into chapter 18 is kinda pointless as most players will never get there. Adding it to earlier chapters is unlikely and adds problems, too.
Adding it to the MA is a possibility, just make a tech(s) unlock Magic Academy level 6 (and 7-10?) With the Spire I think paying diamonds is an acceptable cost. Those new MA level(s) would only unlock recipes in the new tab though, not speed up enchantment production as the earlier levels did.