well, to answer your actual question, it went nowhere. all of those things you list as features of Authentic Buddhism are the basis for practice in Theravada and Mahayana.  Buddhism is view and technique. techniques for realizing view have changed, been refined, and been expanded OVER TIME. view has been investigated, turned inside out and analysed at great length. that's all.  don't be fooled by the proliferation of technique. even in the woolliest-seeming traditions no-one forgets this.  