Not as much plot progression as I hoped for.
Want to know more about the gates/aliens/etc, and be done with this infighting of humans

My favourite interrogation scene of all time is in the last half of the book. It's pretty great.

Why is Clarissa still a character? Her plot arc as the villain of book 3 was perfect. Similarly, Bobbie's character was tremendous in 2 as grunt in the wrong place at the wrong time. Since then it's just been grating coincidences to get her back into the action, John McClane syndrome. Our heroes being involved in every part of the narrative is fine because they are the heroes, but the cast of recurring peripheral characters makes the universe seem small.

It's almost like the writers don't know where to go with the alien mystery plot line. In books 3 and 4 they tease us with the idea of the race that wiped out the race that created the protomolecule and then jkust leave it hanging.

I see why Clarissa is still around, though. I see her as a foil to explore Amos' character in more detail, but book 5, while it gives us great detail about the motivations of the 4 interplanetary Ronin that are the crew of the Roci, the Free Navy plot line is unresolved by the end of the book which then forces book 6 to address that and the alien mystery keeps a back seat.

One other question I have comes from ship names in Book 6. I've seen a "John Galt" and a "Dagny Taggert" which leads me to ask which culture has the Ayn Rand fixation, Belter or Martian (since the Free Navy got most of their ships from Mars)?

Incredibly they don't even wrap up the entire civil war plotline in 6. After an egregious deus ex machina, the book appears to be setting up book 7's main antagonist as the renegade Martians who have appeared in 1(one) chapter so far?

I don't mind adding a love interest for Amos and fleshing out his character, I read and enjoyed the novella about his youth and his plotline was the best part of book 5, I just think it's a bit lazy to bring back a character who completed her arc and then just... keep her around. For no real reason. She doesn't get any POV chapters in book 6 and she's just in the background entirely.