The show's central premise collapses in its final episodes not because of plot failure but by design.

We watch Lily write code to alter the past — we watch her stand before the DEVS quantum computer — we watch the machine activate, and then the camera cuts away.

We never see whether her timeline branches, whether Devs executes her command, or whether the multiverse splits or collapses because Liman refuses the narrative closure that would validate either determinism or free will. This isn't accidental ambiguity masquerading as depth — the pacing structure enforces it: eight episodes of accelerating certainty followed by absolute deflation in the finale.

You cannot know which is true from inside the system.

What matters is that quantum mechanics and many-worlds interpretation face the identical problem. Both mathematically predict identical observable outcomes and neither can be experimentally falsified against the other — they're scientifically equivalent but experientially irreconcilable. Devs structures itself around that exact epistemic prison.

By refusing to show whether Lily's code executes, Liman argues that determinism itself is unfalsifiable from within a deterministic system — you cannot observe whether your choices branch because observation itself was determined. The show doesn't ask whether determinism is true; it argues that the question is unanswerable, and we've built entire moral and psychological systems on that blind spot.