I certainly agree, for environmental portraiture (usually the most effective in my opinion), there are many successful approaches. Hell, I have seen EIR portraits that were hauntingly beautiful, and I've seen some x-processed portraits that were also quite amazing. But my comments were directed more toward the O.P.s issues.
Human skin tones are an tricky issue in any light; I am just saying that astia has been the only slide film I've used that delivered the skin tones that *I* look for... even in tricky light e.g. dappled shade. In contiguous shade (cloudy overcast) then yes, sure, filter a bit to warm things up a bit if you like. But even then, astia will do the better job.
And no, I am not an astia salesman