Krystophe
I do the same thing with Elemental Dignities and reversals: I don't think one supplants or supersedes the other because they really tackle the issue in different ways. EDs increase or decrease the "power" and "purity" of a cards expression, for good or ill, while reversals change (often subtly) how that expression is received. One is a matter of "quantity," the other more a matter of "quality."
This makes sense.
It also touches on another reason why I moved away from using inverted cards; I started looking at the interaction of elemental correspondences. That seemed to me like a more "organic" approach, taking the symbolism inherent to the card into account as opposed to the more "artificial" method of inverting cards. But using both elemental dignities and reversals in the same reading seems cumbersome at best, so the organic method won out.