I see what your saying about not having a arc about the main land, but doesn't a part of you feel like theirs still some unanswered questions? Like theirs a whole world out there that'll never get to see (unless the author does a sequel or something). I personality feel unsatisfied not seeing all the show has to offer.
It's true it leaves questions but I feel like it also leaves possibilities, like the author said - the main character doesn't have to go on to solve all the problems. He could wait a few years and even use Raki & Claire's child as a new MC instead, which given the time since Claymore has ended could actually work out much better than that garbage Boruto. Which since I brought Boruto up, is the opposite of how Claymores author described how a main character tries to solve all the worlds problems. Naruto DID solve all his worlds problems, they just decided to manufacture a bunch of bullshit to keep it going.
Weather Claymore's author wants to or not I think that the story ended on a proper note, the main plot was resolved for all the characters and honestly that's all a story needs. Dragging something on for too long can lead to proper story and character structure to get lost and turn into a big mess.