Everything in this universe, short of quantum nuclear decay and atmospheric noise, is deterministic. AI is deterministic; we just often don't understand why the outputs it gives arise from the inputs.
Similarly, a FIFO system for a share sheet is definitely deterministic, but that is immaterial to the question of whether it is predictable by its users. And that's what matters.
Sure. And I'd say that for some other use patterns FIFO quickly becomes acceptably predictable, though not maximally. The tradeoff is that pressure to manually edit the list is greatly reduced. Which is also something that matters.
My personal preference is for rock-solid spatial consistency plus manual fiddling, but I doubt that'd be best for the greatest number of people.
Similarly, a FIFO system for a share sheet is definitely deterministic, but that is immaterial to the question of whether it is predictable by its users. And that's what matters.