Its also about getting to know the other aspects of some people's lives and the struggle they go through, that other movies/TV shows aren't focusing on, as we're used to by HBO you can't really pick a side to sympathize and find a connection with, because simply everyone just wants to survive in their environment.
you can also relate the show to Mad Men (2007) for not including lots of acton and thrill scenes, and focusing more on personal experiences with daily encounters.
I liked how the show represent the aspiration of today's generation and/or fear of the technological advancement specifically in the A.I field. Many recent TV shows have drifted apart from the current aspects of the world we live in (biography, medieval ,true story-crime, superhero fiction).
You can't help but notice Producer J.J. Abrams handprint as you can relate lots of features to Lost (2004) ,first in how the characters in most of the season are far away from each other with their own journey of self discovery that eventually gathers them to the season's ending. Same character tropes from both shows like the Man in Black (William) clearly similar to John Locke Terry O'Quinn (also Dolores from season 2), Bernard Jeffrey Wright and Benjamin 'Ben' Linus Michael Emerson from Lost (2004) they both did switch sides throughout the story.
The open mindedness of the authority figures "parents" is at its peak on Everything Sucks! ,and it's due to how the parents relate to the teenagers relationship experiences, not sure if it represents the 90s or not, I've watched a video on youtube titled "Explaining the 80s Movie Craze" its about how every movie era looks back on the previous eras, and how it's related to the directors/creators nostalgia.
Big Little Lies is about how the first years of a kids life determine their personality as adults, and the effect of violence which leaves a hard imprint on the kids memories that is reflected on people around them as adults,
but we also learn that its not always too late for a change, theres always hope, its just harder when people get used to things as time passes, kids represents hope and purpose.