If the vex share a single mind across a million units like the ghost tells you, then how was Oryx able to take one without the others knowing and shutting it down?
Does this shed new light on how the vex minds work? Two groups from mass effect are good examples of how the vex may really work
They may be like Rachni, a species of sentient insects who can communicate with each other at any distance via a sort of biological quantum entanglement, the rachni function almost identically to an ant colony, where the queen controls her workers with pheromones, the rachni queen does so with this form of communication and with sound, with the queen refrencing song everytime it talks about speaking to its children
And the other 'race'; the Geth, each geth unit contains millions of programs that must reach consensus before the unit makes a decision, in fact, prior to reaper upgrades, a single geth platform will refer to itself as "we" rather than "I"
Then there are Geth Primes, heavy tank platforms which act as command hubs that link all nearby vex together, so they may share 1 large mind made up of billions of programs. The geth also have server hubs to contain their programs, as there would need to be trillions of individual platforms to house all these programs, which the geth do not have the resources to create.
Maybe the Vex are similar to both races, in being able to commune with other vex regardless of distance like the rachni, the ghost does say "they can warp across star systems in an instant" so they can likely communicate at long distance with no lag. And the geth in being individual platforms that 'wirelessly' link other units with hubs for communicating and sharing knowledge with the whole, the Vex confluxes and possibly the whole of mercury
Edit: nowhere do I say Vex are all robots and cant be taken, dont reply with "they have brain jizz" I already know that
Edit 2: I have equipped my thinking emblem, prepare thyself
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He's a god.