Same reason why calus’s bounties state they give glimmer when they actually don’t, and why heroic story missions/adventures do not give any rewards whatsoever. Bungie intentionally makes the game unrewarding because they are shitty, incompetent, greedy developers.
You obviously don't know bungie.
Normally Bungie's pedigree would speak for itself, but lately it seems like Bungie's putting less and less work in, letting obvious bugs and glitches slip through testing. By now I just want Bungie to release a major update that doesn't have something obviously broken and untested in it.