I think the point is that a zombie show contained in a movie or mini series can stay fast , relevant , scary and then a conclusion, either good or bad . This show is stuck in the survival stage and hasn't had any hint of a possible happy ending , till lately. If they can make it to Terminus and the survivor camp , they might have that happy ending.
Like in World War Z , they started with the crazy apocalypse , then they led to a survivor camp. A possible happy ending for the people in the movie. Of course there will be sequels , so we know there is no happy ending yet. But this show could delve into the scientific and give us some more details of interest to make it more interesting while they are in the survivor stage. They could of come across that scientist in the first part of the series in the CDC and he could explained more about what the government knew. IF there was still any government left. What about the world as a whole? Like what causes the zombies to eat people . IS it a rage virus like in 28 days later? What happens to the flesh and guts that the zombies eat? Does it digest in the undead bodies? IF so what happened to Carl's momma when her dead body was consumed whole after Judith's birth ? How long does a zombie last before all the flesh rots off their skeleton? Will they eventually all die out and the humans can take over the earth again? These questions would give the characters & the audience, some hope for the future. Without hope the characters should end up so depressed that they give up and commit suicide and or so crazy that they are no longer even human any more.
This show needs to address some of the bigger picture questions are the audience will die off through the boredom of seeing the same crap perpetually over and over and over again. The very definition of insanity is doing the same thing over and over again and expecting a different outcome. This show and we the audience are stuck in this very insane cycle. The question is will we, the audience drop off first or will the writers get smart and flesh out the mythology of the zombies like I have already suggested, in order to keep us on this other wise very redundant ,boring , journey?