Khaled Hosseini's "And the Mountains Echoed" Reverberating Storytelling that is Grating

Khaled Hosseini is the best selling author of "The Kite Runner" and "A Thousand Suns."  Hosseini is an American writer born in Afghanistan in 1965.  His family moved from Afghanistan to Paris for his father's work when he was 11.  The family was unable to return to their native country because of warring factions and sought political asylum in the US in 1980 when he was 15.  Hosseini did not speak English at the time and the move was very jarring.  He was educated in the US and is a physician as well as a best selling author.  The novels echo back to his family's diaspora.  Hosseini's contrivance in his newest novel "And the Mountains…" is to weave interlocking stories of family members and friends who are become separated and yet their lives miraculously intersect in the future.  As one of the novel's main characters who becomes a plastic surgeon learned in Kabul "…it is that human behavior is messy and unpredictable and unconcerned with convenient symmetries.  But I find comfort in it, in the idea of a pattern, of a narrative taking shape".  I find the forced of tying all the timelines tiresome although Hosseini heavily relies on this gimmick "like you have missed the beginning of a story and now you are in the middle of it, trying to understand." I find the loose threads tying the main characters together to be a tiresome stretch which steers away from the gravitas of the political/social & economic strife the underlines the novel.  Mostly, I found the meanderings tedious mawkish melodrama.  "It's important to know this, to know your roots.  To know where you started as a person.  If not, your own life seems unreal to you.  Like a puzzle."  I'm puzzled why "And the Mountains Echoed" garners mass appeal.  Tt felt like a doppelgänger of his previous best selling books.  (Oh, now I get it.  I just don't find his writing worth investing the time.)