I'm not the biggest Macallan fan, either, kk, but I think you're being a little unfair. First of all, of course the cask strength is darker--it's undiluted; and anyway, there will always be variation in color, quite a lot in the case of sherry-casked whiskies. For all we know, dark color is one of the criteria Mac uses for selecting casks for the cs.
Second, Macallan always claimed that all of the malt in their bottlings was exclusively sherry-aged, and since the release of the FO series, they no longer claim that, obviously. It's very obvious that there has always been Macallan whisky aged in bourbon casks, which for many years was destined exclusively for the blender.
Macallan has always (at least in my memory) hyped itself as the "Rolls Royce" of malts. I have no problem with that; all distilleries hype themselves as the very best. The remarkable thing to me is the large number of consumers who swallowed that hype whole--not to suggest that their opinion was invalid in any way--and the ferocity of the backlash when they felt disillusioned and even betrayed. CV the Amazing Revilo. Macallan is a distillery which is, in most respects, just like any other, but with certain peculiar problems (just like any other). If one believes their malt is not what it used to be, well, that's how the cookie crumbles. They are not the only ones.