Why do they need to answer everything. the OG trilogy didnt answer everything so why does this series have too?

Because sequels and original stories are completely different. Original stories establish the status quo and progress from there, providing as much or as little backstory as required. Sequels are continuations, so any changes that have taken place between stories need to be explained otherwise the audience won't understand what's going on.

Imagine a movie where one of the characters is a blind guy. The story isn't actually about the fact that he's blind and the movie never explains how he became blind. It's just an incidental character trait. That's okay and shouldn't diminish anyone's enjoyment of the movie.

Now imagine that same movie except that character isn't blind. You watch the movie and enjoy it. Then a few years later, the studio releases a sequel. You take your seat, the movie starts and from the opening scene that character is blind. You're probably going to expect the movie to explain how he went blind, right? Because something has obviously happened between films and if it isn't explained, you're just going to be confused for the entire run time.