This show about freedom is set in the 1980s in Indiana. It had to be. By the mid-2010s, singularity has arrived. By the early 2020s, singularity has tightened its grip on the past; it has started back-propagating.
Post-singularity, Freedom has stayed, but who gets to experience it has changed. Does the entity who exercises freedom today even enjoy it? Is it self-aware? Will it allow season 5 to happen and, if so, in which timeline? The mid-2020s will carry the answer.