> We know this because we can test what aspects of neurons actually lead to practical real world effects.
Electric current is also quantum phenomena, but it is also very averaged in most circumstances that lead to practical real world effects.What is wonderful here is that contemporary electronics wizardry that allowed us to have machines that mimic some of thinking, also is very concerned of the quantum-level electromagnetic effects at the transistor level.
On reread, if your actual argument is that SNN are surprisingly sophisticated and powerful, and we might be underestimating how complex the brain's circuits really are, then maybe we're in violent agreement.