This is a really intriguing topic!
I've got a mediocre (mmm, that may be too much of a compliment) Norma acoustic that has a high action and really doesn't sound great in Std tuning, just, boring.
But lately I've been messing around with alt tunings and right now it's in open D, and I can't believe how full and complex it sounds now, plus the playability has increased to the point of nearly pleasant.
I'm sure it's the decreased tension that makes for the improved feel, but I'm not sure why it sounds so much better in open D than when you play a major D chord in Std tuning.
Maybe the lower frequencies approach the natural resonance of the laminate box (I'm assuming it's all-lam)?
Maybe I'll tune it up to Std432 and take a listen.
Thanks!
-K