Where's my game type

It really ticks me off how falsely advertised Reach was. I mean, i haven’t once played the game type firefight versus, and they went through the trouble to make a video about it and show a preview to a whole crowd of people. I believe if they were to implement that gametype into the matchmaking list for their new title update, it would take off and really be a fun experience for those of us who have wanted to fight as the covenant as well.
It feels like they show me all this cool stuff and then restricted it. Why cant i use the target locator in a custom match, or drive a civilian truck? Why can’t I forge on other maps very well besides Forge World? As a fan since Halo CE: I would have liked to see them go above and beyond and give this game endless possibilities, but i feel like iv’e been cut short.