This show has been a balm for my worst nerd impulses since episode 1, and I will miss it. As finales go, I think this was damn near perfect, too.
Like others have mentioned, Rutherford's sudden frustration with the Cerritos felt a little off to me, but that's really small fry in the larger picture of
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a bona fide, stable quantum portal to parallel universes hanging around the Alpha quadrant since 2382!
Wow, you'd think that would have been brought up even tangentially in Prodigy or chronologically later set shows? It could even feasibly have been used to
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bring Mirror Giorgiou home to her own universe in Discovery s3.
But what do I know, it might not be as stable as it looked in this episode...
I was thinking that it's interesting that crossovers with the Mirror Universe stop completely at some point around the 27th Century. There's a story there.
What was Cronenberg Kovich's line about that again? "The Mirror Universe has been drifting away" or some such?
I'm willing to bet the Terran Empire tried some multiversal invasion that exploded in their collective face and blew them across the quantum plane (if that's a thing). The Quantum portal could easily be written into that.
And yet it endures. Unlike the Terran Empire, which fell centuries ago. Were you aware that the distance between our two universes started expanding sometime after your departure? There hasn't been a single crossing in over 500 years. You didn't know that, did you? You're all alone now.
Oh absolutely! That's pretty much a 400 year bracket starting with Disco s1 (2257 CE). Plenty of opportunity for Mirror Universe shenanigans even beyond the Picard years.