The examples I gave were the ideas around use NDE passive to accommodate EP active skill to prevent instadeath in reflect packs. Or Pacifism passive to accommodate a build that does not use serenity or DS, which means getting caught in a lot of sticky situations with jailer and frozen monster packs. So OWE will not do anything for you when your EP explodes in reflect packs, and will do nothing when you are locked in place while plagued and arcane beams are hitting you (and you absolutely cannot move). In both of those cases, OWE would provide very little help because the assistance you get from OWE is "always on" whereas NDE or pacificism provides much better support in limited situations. Think of those other passives as giving HUGE EHP boosts when you need it most while having enough EHP in regular situations.
ManUnited... since you've gone through the heartache of going OWE free, I encourage you to use different skill combinations. You might actually find yourself stronger in the end.