Why are some Dungeon Minions and EW Bicolor Orchestrion Rolls still Market Prohibited

[Zaniel]

The thing about introducing a system is you actually have to utilize it or it just turns into a relic of the past. E.G. guildhests & combat leves.

This is actually the best answer, it promotes activity through the whole breadth of the game and makes collecting feel worthwhile as an after-MSQ activity.