Your question is an interesting one! Perhaps embarrassingly, I never really considered "elemental balance" as something to strive for, but of course it is and it makes the system of symbols one selects to work with quite important!
As an example, in geomancy, the two elementally-balanced symbols—Populus (passivity) and Via (transformative, focused activity)—are situationally useful, but they're also kinda extreme and don't stand out to me as any more or less desirable than the others. So if that system is framing how one thinks about their path, then "elementally-balanced" is something that only even makes sense ⅛ of the time.
On the other hand, if you're using a different set of symbols, it could look very differently!
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As an example, in geomancy, the two elementally-balanced symbols—Populus (passivity) and Via (transformative, focused activity)—are situationally useful, but they're also kinda extreme and don't stand out to me as any more or less desirable than the others. So if that system is framing how one thinks about their path, then "elementally-balanced" is something that only even makes sense ⅛ of the time.
On the other hand, if you're using a different set of symbols, it could look very differently!