This was a big take away for me as well, there's so many plot threads that come up and don't really go anywhere.Why don't we hear from the father and the situation with him ever again, especially since we are shown that it affected the MC's life (the money, Steph, Hoemeland etc). Why did his sister show up in the previous episode just to disappear again? What was her purpose then?
Or the situation with the guy, I forget his name, the bully, who stole Linda's ring. There's a buildup towards something sinister, only to be resolved in a couple of renders by Cece, without the reader learning any details.
There are some more examples like these, which I think didn't serve any real purpose and if they weren't there,the story would be much tighter.
It wasn't as obvious when playing it a chapter at a time but playing through the completed thing from start to finish it's very hard to ignore.