I can definitely understand that people who were actively invested in those loose threads are left unsatisfied, while newer readers simply can shrug them off. The reboot unfortunately was brute forced into the storyline because of the legal issues (I assume), and while I kinda like the way they handled it from a story perspective, its very apparant that they weren't left the grace of tying up those active plots beforehand.
For example, I was left wondering whatever is going to happen regarding Mighty and his sister. I'm sure a lot of people have such questions, especially long time readers. But its easier for me to simply appreciate the new plot and anticipate whatever new stuff they will be coming up with specifically because I don't have any deep ties with the previous characters/plotlines.