Having read the books multiple times, I am very aware of their weaknesses. The story is about humanity, but it is not about humans. There are well written and conceived characters, but they are by far the exception from the rule. Intentional or not, this weakens the series, and it's a problem that only gets worse with each book.
This was a series of books that examined the idea of life at a literal universal level. A gargantuan undertaking, and one that is well executed.
So having the opportunity to take a book with rock solid philosophical assertions and reasoning, but weak characters, and adapt it was an opportunity to make the characters matter more, to inject more humans into a story about humanity.
Unfortunately, the writers and producers somehow managed to create even weaker characters. They cut the number of characters for the entire book series by an order of magnitude, but then instead of shoring up the weaker areas of their book counterparts, we get... the cast of "The Big Bang". Which is the LAST THING the series needed.
I didn't want a one-to-one adaptation. Tencent's did that well enough, but this is more akin to a high school adaptation of Macbeth that takes place in 1920s gangland Chicago.
The concepts deserved better.