A lot of what set up the "darker times" in Picard was already in place before PIC even came into the picture. The destruction of Romulus? Already set up in the 2009 Film. The darker Federation? DS9 already laid down the groundwork. Picard feeling melancholy about time passing? We saw that in both Generations and Nemesis.
The Federation "enslaving" AIs was already there in the form of the EMH Mark 1s working in mines toward the end of Voyager. PIC just applied the same thing to Synths through flashbacks. Picard was worried about creating a race of "disposable people", which those Synths seemed to be. And Data always wanted to be more Human, so Dahj and Soji actually are more Human.
I think PIC took what was already there, picked up with it, and continued further with it. Including by showing what the aftermath would be like. The way it's pushed, the story all makes perfect sense, when you extrapolate where it could've gone.
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