Maybe this is just me and/or my RNG is bad, and I'm pretty sure the Gambit player-base has experienced this ever since Final Shape has released. Bungie said they've reintroduced the Dreaming City's Cathedral of Scars map back in Gambit at the start of Final Shape. However, during my gameplay in the mode over the past couple of days, I've yet to come across it in the playlist (it's there in private matches though). Perhaps Bungie should look into this and increase the chance of getting this map to pop-up? Also, add a Tormentor to spawn at a point during the Primevil phase, make it so a team won't kill it so quickly. Disable invasion portals for this until the Tormentor is defeated.