You really have to wonder why they use "Sanity" to label the stamina currency.
Gameplay and lore-wise, it would be more accurate to use "Focus", because the player character, the Doctor, is figuratively uploading his consciousness into PRTS system so he can see the whole battlefield and command the deployment of units and their skill usage just like how we played the game. Hence why every operation would take toll on the Doctor's brain.
Even i personally believe the AR in the name to be referring to this element of Augmented-Reality.
Oh but don't get me wrong, i'm fine with the decision of using "Sanity" cuz it works really well for the memes. 😎
It's just, it gave the impression that there will be a common occurrences of eldritch or lovecraftian element in the lore, but all we get in that department is really just the Abyssal Hunters' backstory.