I'm trying to raise attention as much as possible on this issue so here's some for your post. These missing armor sets are very solid, if not great, options for fashion and Ada-1 should fulfill her purpose as a vendor completely. Season 2 (Curse of Osiris) to Season 11 (Season of Arrivals) armor sets that were all in Xur's armor pool pre-Edge of Fate are almost all missing from Ada-1's inventory. Sets such as Midnight Exigent, Opulent Stalker/Duelist/Scholar and Lost Pacific were great picks and we can't miss out on these pieces. A few exceptions are the Prodigal armor and unique Class-items (like Cayde's memory) from Forsaken being sold by Ada-1 but not the rest of Year 2 campaign and seasonal armor (Scatterhorn is obtainable through Dares of Eternity though). On the other hand, Year/Season 1 Faction and (now sunset) Destination (like Lost Pacific or Gensym Knight) armor sets are missing from her inventory although Red War World pool armor is present. I really hope Ada-1 can receive Xur's old armor pool so that we can complete our transmog collections.