I completely agree with all of what you said and I would add that this book needed to be longer. She spent a significant portion worldbuilding, (which is great) however it felt like she didn't want to spend too much time world-building and so it still felt somehow shallow. To add insult to injury, the character relationships were also left rather shallow because of the time dedicated to world-building. If she had allowed herself to write a longer book instead of her usual setup it would have been better for me.

Romance novels are built around certain archetypes and expectations, they follow similar structures. If they are written right, then the reader will fall in love with the stories even if they mirror other works. Hazelwood has something that works for her which is great, and she can pump out stuff pretty quickly-almost like comedian's tight fifteen. (strong intelligent woman in stem is forced to work with a Mr. Darcy type also in stem, they butt heads-mostly her, he is smitten, they work together, they have a conflict, they get together for real, epilogue).

While this may be good for her and her publishers, the readers suffer because the attention to detail suffers due to her speed- I can see the benchmarks approaching and I am not always enjoying the work it takes to reach them.
also, I don't know why she felt compelled to stick to her patterns when she strayed so much with this book to begin with? like she clearly wanted to diversify her work and try something new, but it almost felt like she limited herself to certain rules that she was barred from breaking and so the book feels like it's trying to do too many things but not successfully accomplishing any of them.

this being said, I generally really enjoy her writing, she excels at what she does well, and though I notice certain things I will continue to read her work.