Loot specific missions

I remember playing back in 1.3 and there were certain incursions and missions that dropped specific loot (i.e X incursion dropped reclaimer, Y incursion dropped alpha). Was there a reason why they took that out of the game? I feel like at this point with as many gear sets and items we have, and the RNG of this game, we should be able to target a particular gear set/item without having to do random missions in the hopes of getting them.

What are your thoughts on this?

EDIT 1: I'm not saying Limit specific loot to specific missions!!! I'm saying make particular missions drop certain loot!!!