I think it comes down to risk tolerance and view on multi asset correlation(risk on/off). If you have a view whereby say the US is selling off but Japan is going up, then it makes sense to always be long somewhere.
If you have the view that risk assets all go up/down at the same time with differing degrees of drawdown, then no perhaps being long EMs vs SPY isn't a great idea.
You could throw in negative correlated assets(risk off) in there to reduce the drawdown, but then that's a bet on historical correlations. I believe for the last 50 pages or so you have talked about this.
The issue of short vs cash from a long bias is an interesting one and personally I have looked at it as if I sold out my longs, I must invariably be short. So why go to cash? For me it clears my mind, having a hedge on even if it's a delta 1 hedge is another position I have to manage. Cash is simple, I just wait.
From my experience, too many hedges on simply complicates the whole procedure, especially if not delta 1.