To be fair, SSX and the other MA projects are not nearly as mission critical to the operation of the NEC in the same way that Gateway / Hudson River tunnels, CT moveable bridges or Portal North are. The things they've funded in this round probably needed replacing several decades ago by sheer magnitude of decrepitude and how much of the NEC relies on them working to move trains - without them, you've functionally got no NEC north of NYC. SSX on the other hand is just a nice to have for expanded service.