I think around two or three episodes into this season, I was finding the main arc pretty padded, contrived and grating. The loss of conceptual momentum is felt in the decreased verisimilitude and increasing number of non sequitur and surreal moments. I don't find the Keir cult of Lumon compelling as a block of the overall rote world-building, and the majority of the antagonists are entirely uninteresting pantomime villains.
The show can't decide if it's a Kafka short or a self-consistent dystopia exploring salient social questions. But it certainly knows it's a big hit, so the resolution of a few seemingly very urgent plot developments, such as it turning out that Cobell invented the severance technology, is already held back for future padded seasons.
Innie Mark choosing Hellie R over restoring his outie self to Gemma should've been a good season ender, even if I think it's a misuse of the show's entire premise to narrow focus onto the main character's schizo romances. But the closing "Windmills of Your Mind" montage struck me as the showrunners admitting they'd cornered themselves with material they don't know how to land dramatically.
The sequence critics are all fawning over where Mark spoke to himself via camcorder was also poorly written and executed, for mine. And the Mervyn Peake stylings of the giants' battle between Drummond and goat lady was visually striking, but only contributed to the incrementally self-weakening preposterousness of the whole.