Another option would be to remove the "opt-in" gameplay around Thargoids. If Thargoids could interdict us in supercruise, and did so intentionally (like the regular annoying NPCs do all the time), and do so in random systems at the edge of an actual war front, this too would make them scary, since most players are not flying AX ships most of the time.
To be fair this does happen. I've been a fierce critic of the opt-in version of things since day one as it removes all danger from the game whatsoever. Bear in mind, Thargoids do interdict you, i've been pulled out of Hyperspace numerous times but nothing has ever happened. Just a quick look from the Tharg and then off they go, no nicking your stuff, no probing, just a pointless encounter.
Hark back to the good old days of Elite when you were pulled out of witchspace by the Thargoids and were lucky to get back into normal space in one piece. Now if that happened as you mention with npc encounters, things would be different and we all would find them far more dangerous and learn to fear them. At the moment, they are a bit pointless, as they can be avoided at all times, and should you be pulled out of hyperspace by them, all they do is sniff your butt and then fly off.... ooooh i'm so scared...NOT
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