I completely disagree. I think epiphanies are real and sometimes it doesn't take much to push you over the edge. She has been running herself ragged not just all season but the past three years (and to those who say oh she's doing it an episode or two before the finale, she doesn't know she's in a TV show!). I honestly think due to her natural tendencies to follow orders and lack of empathy, especially without Phillip, she has literally turned into an all-out automaton.
Back when they were together he made her question her choices and kills multiple times (from the 4th episode where he convinces her to sit on the General Hague Intelligence to the episode where they fumbled the military base op to the episode with the plant schematics janitor). With him out of the picture, I think not only have her natural spy tendencies been dominating but also the lack of time due to him not helping hasn't allowed her the ability to sit back and think about anything (she's said she's been exhausted all season and it shows).
Just like Stan. While many of you say he's dumb and had taken stupid pills after his highly undercover op with the Klan. He knew he was undercover there and didn't develop any personal feelings for the men he was with. This has been different. There are reasons he has been blindsided because he came into this as a person with no shield built in. As long as its taken to have him figure things out with P&E, I think it's because he needs them more than he'd like to admit. While Elizabeth has poked fun of Phillip's friendship with Stan, I honestly think (more than both of them know/would admit) that's really been the only thing stopping him from going after them (I mean we all see him targeting Elizabeth first. There's a reason for that choice.)
While his spy instincts have often been repressed because of the feelings he's had for those he felt he should be loyal to, his subconscious has always been working over time. (Remember that one dream sequence with him in the office with Martha in the background stealing things off the mail robot.) So in summary, I completely buy from both of these characters "transformations" because sometimes all it takes a little push it nudge for something to click and completely change everything.