In the future, people have immediate access to every memory they’ve ever had. So if the mind is indeed one snapshot after another, everyone now gets to see each and every one – none lost in the shuffle, for better or worse.
Choosing NOT to have such a total recall is considered odd (and rare).
Much more small-scale than the previous two. Also pretty predictable (if well done), which is a huge disappointment after episode 2.
But hey, at least it makes you think…a little.