Fugazi Keira Knightley is not a very convincing scientist. Should've made her a venture capitalist because turning on the nanofiber machine couple of times was as deep as they went into her scientific abilities.
Using nanofibers to slice the ship into hundreds of pieces was the dumbest way to 'safely' retrieve the communication with San-Ti. High Sparrow had to hold the drive at the perfect height while he was sliced in half and then slowly fall on it so it doesn't get crushed by the rest of the ship collapsing onto itself.
Saul the Wallfacer is such a high priority target for the San-Ti that they decided to send a Proud Boy member to take him out instead of just crashing his plane in the middle of the Atlantic.
Young Dr. Ye did her thing, show was more captivating during flashback scenes. Also present day Dr. Ye's character felt underused, not sure if she was handled differently in the book.
Friend group chemistry was not great, it wasn't Wheel of Time terrible but should've been better. One-night-stand Ygritte did more in her 2 minutes of screen time, before she got moved down by an Audi, than Auggie and Jack did the whole season.