Remember how Spring Awakening flopped and Next to Normal has never even made an attempt?
Yes, I remember how Spring Awakening flopped (which was credited mostly with its marketing) and still managed to win the Olivier for Best Musical, though personally, I've never considered it a "substance" musical. More like a glorified after-school special with a gimmick. And I'm not sure what insight you have on why Next to Normal hasn't been produced in the UK, but shows like London Road, The Hired Man, Martin Guerre, The Fix and Spend Spend Spend haven't been produced on Broadway, either.
But thanks for condescending to me. Appreciated.
You opened the door of condescension, so...you're welcome.
"What can you expect from a bunch of seitan worshippers?" - Reginald Tresilian