I'll offer a few thoughts here:
Jo Malone frags are indeed very simple, and because of that, the new sales tactic is to encourage blending, mixing, layering, to accomplish more complexity and a give a sense of individualization to each customer.
As a Perfumer and Artist in many mediums, From the Artist's perspective, Don't you dare mess with my work, I've labored long and hard to perfect these artworks, and they are "DONE!" You don't add to them and you don't take away from them... One of my artworks is a Media presentation, and someone wanted to shorten it. The reply from my friend was: "You don't crop the Mona Lisa."
My Fragrance "Ere", which took two years to perfect with over 125 trials would fall into this category, I'm afraid... It's DONE and I don't want anyone messing with it. :-) My frags are intentionally very complex, that is a part of my hallmark, but not all other frags are that way.
And because I'm an Artist myself, I try to honor what another artist or composer has labored so hard to accomplish, I characterize this as: "As Intended".
Use it, enjoy it, as intended, and don't futz with it.
But I'm afraid that this sentiment really only encompasses the highest arts. Lower arts, like mass market fragrances that had too many cooks spoiling the pot, too many accountants, and too low a level of high quality ingredients, (If any at all to begin with...), these are seemingly prime targets for "adjustments", as necessary for your own tastes and desires for modifications.
But really, in the end, after you buy my stuff, it's yours to destroy or enjoy as you see fit.
I hear about some folks in the middle east who will buy a bottle of something, and dump the entire bottle on themselves at once, (eek...)
They obviously make the decision to *REALLY* enjoy their frags...
I need *A LOT* of those customers...