Earlier quoted context omitted.
The serotonin model of antidepressants just doesn’t pass a sniff test. Something else is going on there. How they say they should work would mean they work in the first dose and possibly that don’t require tapering off. But that’s not what happens in the real world. If we understood what’s really happening we could target pathways better.
The "serotonin model", actually called the monoamine hypothesis, hasn't really been taken seriously in the field for decades, except by naysayers like yourself who continue to use it as a strawman.
…and by basically the entire general public. Big pharma did a great job on the “depression is a just a chemical imbalance…” awareness campaign, but absolutely dropped the ball on the “actually we were wrong about that” campaign, so that’s still what most members of the public tend to believe.