Like all of poor Whitaker's run, this episode works a lot better if you don't think about what you just saw at all. It's not as bad as "the war of Space vs. Time" (still the dumbest thing to ever get said on Doctor Who), but it was pretty bad.
Which is a shame, because a lot of the crazy ideas during this run and finale were pretty neat -- Cybermen made from the whoops-maybe-we-didn't-actually-kill-them-all-again Time Lords? COOL! We're not going to explore this at all, though -- but unlike the gonzo ideas of Grant Morrison, who does this far better than Chibnall does, there's never a good structure beneath the ideas, just the idea that if enough crazy ideas are thrown at the audience's face, it'll add up to a coherent story.
Which it doesn't.
I'm hoping that, once there's a steadier hand at the wheel, Whitaker can come back and do drop-in appearances like these other Doctors and companions have.
I very much like the post-"School Reunion" focus Who has on looking at the consequences of being a companion has on them, and hope it continues. The support group in this episode was a nice touch and I hope to see it return in the future.