More cheap cannon fodder that is slower than an engineered T9? Meh. Never saw much appeal in the Orthrus massacre farms that were spires, messing around with the Revenants and Banshees on the ground was more fun. Especially if you suddenly ended up chased by three of the Banshees at the same time (and they will not stop until actually losing track of you, unlike the Revenants which remain close to the barnacles).
... and I looked at what they were doing in Sol during the alert state, didn't seem to be much more than the usual placing of probes and/or sensors. (Has it really been 5 months already?)
Once again, I find myself in the position to repeat that the Guardian logs are NOT a conclusive source of information due to the complete lack of details of what actually happened when they made contact with the Thargoids. Did they refuse to move even temporarily off the barnacles which they'd occupied and likely caused the aggression with when the Thargoids asked so? Did the Guardians immediately take up an aggressive tone telling the Thargoids to buzz off because "They were there first and nobody was looking after those weird looking things on planet surfaces" (would sound very familiar)?
I could go on.
It is almost certain we're just a small and relatively unimportant piece in whatever it is the Thargoids are after or doing, even if humanity loves to overinflate its own importance in the grand scheme of things. Or panic and scream about being attacked as there are clear signs whatever is happening is not a purely destructive assault. If that was the intent behind targeting Sol, they A, needn't have bothered scouting it (which they didn't with Shinrarta but why they went after it is an even bigger mystery), nor B, needed to send a Titan straight into humanity's home/origin system.
Arf even strongly hinted at that we were looking at it with too much of a 'human perspective', which can't be much more direct of a hint that there was another purpose at play than just causing pure devastation. If giving humans a scare and a beating on the head was even ever part of it at all, but the fact Cocijo went right into Earth orbit does suggest some symbolic meaning to the action as well. (But it's easier for people to keep pretending the Thargoids are 'mindless bugs' and 'They made their biggest mistake sending a Titan to Sol', not realizing that it keeps blinding them to the fact that there is more going on and the Thargoids are just as if not more intelligent, but in a different way, than/to humans)
I'd rather take the Thargoids or Nemesis not at all a Salvation hint.