It’s because the chemical balance hypothesis was something that was devised by pharmaceutical companies as a marketing ploy, and has never been substantiated by any empirical evidence.
https://www.theguardian.com/society/2018/jan/07/is-everything-you-think-you-know-about-depression-wrong-johann-hari-lost-connections
Even psychiatry is admitting to this, these days: https://www.psychiatrictimes.com/view/debunking-two-chemical-imbalance-myths-again
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