They should really move unobtainables from removed quests somewhere else.

[GeminiReed]

I assume you're talking about something specific here but for the life of me I can't think of what. What changed recently that made a non-seasonal/crossover/PvP title unobtainable?

Off the top of my head the "Lighter than Air" title you used to get from unlocking flying in Tailfeather. That quest was removed when they shifted the unlock to completion of ARR.