Like if you will... something out of Star Trek - instinct, indirectly fusing, combining, with conscious control of the craft, when it comes to things beyond local-perception/conceptualization - meaning,.. that one can conceive, of a solar system, but as the SCALE of the universe gets larger and larger, you need more and more experience, to be able to consciously create a MENTAL MAP of it. look them up, if you don't know what a mental-map is ... so if you presume that for a moment, i see no reason to assume that one particular terminal system, would necessarily NEED small details like numbers - if it is already seamlessly designed to work with bio-organic circuitry, putting pressure on the organism, INSTEAD of relying on bio-cybernetics,.. errr bio-mechanical sort of cross-over,.. of what we would call cybernetics,.. then it is liekly incredibly well TUNED, you might say, to the operator. That is, instead of needing to depend, on cybernetics, to convert/export conscious desire INTO something a computer can understand and interpret.
so to dramatise that,.. if you THOUGHT about wanting to go somewhere, something in your head, that could translate, convert that, into data that a system you're plugged into, in cybernetics,.. requires stuff in your head, to be installed / configured, yeah?
Well in advanced bio-mechanical tech like the thargoids have, the much larger system, can perhaps more easily/efficiently, interpret natural thought/signals, withOUT much cybernetics , if any at all, or whatever their equivalent is.
OK, Vurrath, what are you saying that again?
OK,..

... i'm saying it, because if their communication is also already adjusted to the efficiencies OF-that,
then they would likely have no NEED,.. for consciously needing to input / or perhaps even remember, DETAILS,
of systems beyond their identifiers - names of systems, catalogue number of them,.. whatever.
So what i'm saying is,.. although no doubt their ships/motherships have all kinds of integrated bio-encoding to process numbers and whatever else, names, details of planets, whatever,
CONSCIOUS number-/calculation- -handling, should not be assumed.
We're talking about a sentient bio-circuitry advanced civ, that has been going around for literally MILLIONS of years,
not just a few thousand.
I'd say THAT's a reason to be hesitant to assume ANYthing, of numbers NOR the equivalent of letters of alphabets,
at ALL.
They might have a kind of legacy/backup communication memory in terms of their biological origins, that is sort of antiquated / matured-OVER,
but that's no reason to assume that their SHIPS, which are grown moreso? than designed, you might say,
were ever designed to RELY, on pardon the rudeness, 'human-error' .... 'thargoid-operator error'
if you had millions of years to tweak and re-tune, and re-sensitivize your ships systems,
woudnt you 'make it as hassle-free, as possible, so you can get back to your insect orgies and whatnot?

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Source: https://www.youtube.com/watch?v=-2mmTDT6W7E]