One thing I would like to see Discovery touch on more though is Quantum Slipstream. Book mentioned it offhandedly in the first episode. I always thought that Quantum Slipstream was Voyager's most sigificant legacy from the Delta Quadrant... the breakthrough propulsion technology that 250 years later was finally a real advance over the Cochrane Warp Drive. That finally provided a way to explore and travel further and faster that the failed Excelsior Transwarp Drive project attempted. Warp Drive opened local space, but with Slipstream, the entire galaxy would be open to Starfleet.
I always liked the books approach of Warp Drive being relatively local space propulsion and Quantum Slipstream being for long haul travel. I hope we find that's what Starfleet eventually did. It would be a little bit disapointing to find that their 31st century and 32nd century ships are capable of just Warp 9.9999 utilizing an engine technology that has enjoyed evolution, but not revolution, in a millennium.
If only Discovery didn't bind the "Jump" drive concept of next-gen propulsion to the asinine "galactical mycelial network" nonsense that exists because Bryan Fuller read about real life scientist Paul Stamets on wikipedia and decided to make a character about him.