agree to disagree then. i dont think its wrong to feel the way you do, that everything needs an answer, everything needs resolution... so i am not gonna argue against it. But i will point out that adding stuff to story to give the feeling of life going on and exist outside MCs inner group and showing that life does not gravitate around MC and peoples lives continue with or without mc's involvement is also a proper writing technique.
Yes, I agree with that assessment. I am more than happy for worldbuilding to occur, but I guess it depends on how it is being used. It depends on whether you are merely adding stuff or asking questions.
For example, if the Alien invasion was merely used as a catalyst for MC's subplots to occur (the date with Annie, the killing contest, the rescue with Dalia, etc.) and remained as an unanswered phenomenon, that would be more than fine so long as it was treated as such. On the other hand, if the questions of how it is started have already begun being explored, as it has done with figures like Hassler and Dr Mercer, then they should be answered by the end - especially if it gives the MC choices to make (like choosing to kill Dr Mercer in 0.8).
If the questions you are asking are used in such a way that leave people wanting answers, then they should have answers.
If, by the end of the story, Cari doesn't tell us who Idriel is, that the Gems of Doom do, how Thanatos lives in Eternum despite being dead and not realising, then I would fairly consider that incomplete. If he doesn't give us a backstory on Chop-Cop and explain how he always runs into MC on every server, that is fine because worldbuilding is designed to be a mystery.
Either way, I think the feelings of a rushed finale have more to do with the format of AVNs than not closing plot points. Leaving everything to the final update to be resolved is what gives a rushed feeling when the production schedule is spread out over many years.