That's not my understanding of how an SMPS works at all. A simple SMPS converts mains voltage to DC and filters it a little. DC is then pipes into some kind of transistors, typically a FET, which is driven by an IC. The output side is coupled to the input side through a small transformer. Feedback from the output is fed back to the switching IC for overload protection and switching frequency moderation to maintain the output voltage. The output is filtered according to noise floor requirements. Unless the output demands high voltages, there's no reason for there to be voltages higher than the rectified mains voltage. No SMPS has reservoir capacitance like a big linear supply does. I wouldn't want to take 47uF at 150V, but I'd choose that over 120,000uF at 32V.
People survive lightning strikes and thousands of volts in the form of common static discharge all the time. There's no arbitrary rules about volts or amp. A few milliamps can kill you with enough volts and a few volts can kill you with enough amps. That's what makes caps so dangerous. In solid state gear the pack low voltage at huge capacity, while tube gear pack very high voltage at relatively low capacity. Both will make your day pretty bad.
People survive lightning strikes and thousands of volts in the form of common static discharge all the time. There's no arbitrary rules about volts or amp. A few milliamps can kill you with enough volts and a few volts can kill you with enough amps. That's what makes caps so dangerous. In solid state gear the pack low voltage at huge capacity, while tube gear pack very high voltage at relatively low capacity. Both will make your day pretty bad.