TL;DR the struggle is real.
Yeah, that's a popular notion (dark side balances the light), but as you infer, it doesn't really jive with what we know of the dark side and also the propehy of the Chosen One. The main thrust of the prophecy was that this person would destroy the Sith, and by so doing would bring balance to the Force.
Examples of "dark side as balance" or "dark side as a natural counterpart" are popular in Star Wars Legends, but usually these philosophies are spun by Sith and the like
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