Parasara (mainstream) Vedic uses even more considerations than Western Traditional in determining planetary STRENGTH, which for them is the same as "dignity" is for our Western approach: anciently too, in the West, it seems that dignity/debility had to do with potential POWER (ie, INFLUENCE) of the given planet, not for whether that influence would be "good" or "bad".
...but I myself look at dignity indicating power of the planet to express its "healthy" qualities (its essential qualities), and debility in difficulty in such expression; hence for me a dignified (net dignified) planet is a constructive influence and a debilitated (net detrimented) planet is a disruptive influence, in the given chart.
But I want to re-iterate that this is only the way I look at it; historically in both Traditionalist and (mainstream) Vedic astrology, dignity/debility was exclusively considered relative to the POWER or STRENTH of the planet to express itself, whether for "good" or for "evil"...