In this set up, Horizon( Which they merged in to Vanilla for free) remains as the main game, while Odyssey, which was supposed to be a successor to Horizon, becomes the Ugly Duckling.I may have misunderstood you but EDO, as the DLC it is, has always been optional. Much like Horizons was also optional while it was a DLC of the base vanilla game. EDH, while it was a DLC, also got a ton of content added to it.
It feels like they are trying to distance them selve from Odyssey with this move, hence no more on-foot content ( No on-foot Thargoids? No wonder they kept quite about them when people asked over and over).
Why would they add more content to Odyssey, which already got " Hype " sold, and noone will buy it anymore - specially since it doesn't even have VR( which was one of the main saling points of Vanilla version).
Feels like this is the end for Odyssey.