Why not more maps for base Team Slayer?

Games Halo 5: Guardians
1

I was looking at what maps were in what playlists, and I was wondering why Eden, Empire, Pegasus, and Orion aren’t in the Team Slayer line up for maps. They were all with team slayer in the beta, and I personally didn’t think any of them didn’t work well with team slayer.

Does anybody know why they’re not in there?

2

Well Pegasus, and orion are -Yoink- forge maps, so for once 343 decision making actually makes sense, until you try to think about why eden and empire aren’t there either…