If you want TLOU to be a no-filler series you are expecting the wrong things hahah. Think about it, how boring of a roadfilm would it be without filler episodes that show other aspects of life in a world like this.
E + J figure they need to be in X location -> Go there, but meet some zombies on the way
E + J find out X location is abandoned, now need to go to Y location -> Go there, but meet some zombies on the way. etc. etc.
All these zombie encounters on the road that you get in the game, don't translate to film at all. The series would be over in 5 episodes without filler. IMO.