I just finished reading the Three-Body Problem and its sequels. I am a little confused about the nature of the Dual Vector Foil and why it's such a terrifying weapon.
In The Three-Body Problem, the Trisolarians create the sophons, which are explained as unfolded matter. They demonstrate that they can fold them up and then refold them fairly easily.
But later in Death's End, The Dual Vector Foil is used on the Solar System and then is described by Guan Yifan that they will never stop expanding. The book seemed to insinuate that it was an unstoppable weapon.
However, as noted, the Trisolarans have no problem folding and unfolding matter through different dimensions. Wouldn't this weapon just not be very threatening to super-advanced civilizations? So it seems like a weapon like Dual Vector Foil would have no use on them as they could potentially disarm a weapon like this. The chapter from Singer's perspective makes it seem like it's a super deadly and effective weapon.
Did I misunderstand the two technologies, and are they not really similar or relevant to each other?