After the events in 7.3, Sphene congratulates you on a job well done and you see the world around you begin to look like static. Then the scene changes where it was a simulation and you see Sphene (I want her character to live on) is a scientist for Garlond Ironworks that was working with Omega and Alpha on a simulation. Through Omega's ability to traverse dimensions and create complex simulations, Garlond Ironworks was able to take a peak into the 9th, so Alexandria and such still exist but are in their shard. I honestly wanted Alexandria and the 9th be an entire expansion revolving around the Storm Surge and the cataclysms brought by it. It would have had Alexandria's high tech world stay in the 9th and I think the reception would be more positive as I understand many are not a fan of it existing in the Source since it interferes with the high fantasy aesthetic of the Source.