In response to the dev post here, I would like to bring up again what I mentioned here.
Since you are soliciting feedback regarding "must have" Trusts, (particularly those essential to success for a new player,) the ones that immediately come to mind are: Shantotto II, Moogle, and Kupofried.
Shantotto II cuts exp grinding time by literally half (or possibly more.) I'm in the habit of leveling alts and have done it both with and without her, and the difference really is that huge for a new character. She's also our best DD trust even in ilvl content. We desperately need permanent/scheduled availability for her.
Moogle and Kupofried both ease the grind, and more than the non-guaranteed once-per-year availability during May would be appreciated as well.
Once again, I'd like to request that the Trusts which were made available via ROE be replaced in the Winter/Summer Extravaganza since they are always available now, which means it's pointless to keep them in the Extravaganza. To address someone else's concern about accidentally dropping the ROE ciphers, I'd like to suggest adding a new "Cipher" category to the Curio Vendor Moogles where we could buy quest/mission (including ROE quests) related ciphers for a small price. ^^