This has been a real treat to read through!
Bear in mind, though, that according to the lore, the GTVA sent in probes to recon the area and get an idea of what waited for them beyond the node. The UEF detected the probes, even apparently captured a few, and while the UEF rejoiced at the blending of Terran and Vasudan technologies, what the Alliance learned concerned them greatly - that was the predominant psychological mindset, that of Ubuntu. They viewed it as a threat to humanity's long term survival, leading to potentially a population migration back to Sol, and also that if Ubuntu were allowed to spread, it would lead to a widescale scaling-down of the military, leaving humanity vulnerable to a Shivan invasion. Their overall strategy - their endgame, as it were - was the dissolution of the Ubuntu Party (or at least its discrediting) and reestablishment of the Alliance government in Sol. In that regard, Severanti's strategy, to whittle away at UEF defenses to the maximum extent, while simultaneously (and has already been mentioned) minimizing of his own ORBAT's exposure to losses would have eventually, most likely, resulted in an Alliance victory.
Though the UEF was fighting to defend their way of life, in the eyes of the GTVA high command, they were fighting to defend humanity's existence, having had to go out and fight the monsters that lurk in the dark while everyone in Sol more or less got to stick their heads in the sand, confident in the knowledge that they were safe.
On the other hand, it took Steele to come blasting in and his heavy-handed tactics most likely awoke something in the Federation Navy, which led to the Wargods' commissioning. Ignoring the tactics and uses of the ships of each side, had more of the UEF's military been shocked to the same level of capability as the Wargods, they could have conceivably pushed the Alliance forces back through the Node, or potentially cut them off and isolated the GTVA elements within Sol to defeat in detail.