Reason you say?
Some things that reason may dictate:
-Reason may tell you that they aren't going to get into specific features about a game that's 17 months away on hardware that isn't out yet.
-Reason may tell you that as E3 was largely about games for their next Xbox, people were commonly highlighting things that the new hardware allowed them to do, including an increase in frame rate.
-Reason may tell you that those things applied to the new Halo game on the X1, thus why they announced a technical aspect that they could share about the game at that time that they knew fans would be looking forward to.
-Reason may also tell you that they probably have a suite of new features for their new game that they will announce at a more appropriate time, some big and some small.
This is coming from someone with little faith that the next Halo is going to be what I want out of a Halo game. I'm just using my brain a little bit.
There are plenty of evolutionary features that would have been both far more technically impressive and philosophically satisfying to Halo fans than the announcement of Halo ? running at 60 frames per second. Why not announce something that would feel genuinely appropriate for the Halo series, for example
- Emphasis that the next Halo will return to delivering tuly open, large scale, organic combat encounters,
- Larger scale for BTB, 64 players etc
- A prioritisation in taking the unparalleled artificial intelligence the series was (once) known for, even further.
- The benefits that social interconnectivity and stronger processing would provide for Forge and Theater
- Custom Game Server Lobbies
60 FPS is nice, but there are way more obvious ways of selling the next Halo game on a technical level outside of a smoother framerate, the fact it didn't strike them to announce one of these first is highly questionable, particularly as it means they wont be willing to sacrifice the framerate for any of these, which doesn't seem right for Halo...