In my opinion volts alone isn't the best parameter to assess risk.

Its hard to predict risk of death from volts alone because as the title suggests: Its current that will ultimately cause your heart to stop/burns to occur.

If you go by power alone: You don't know anything about the system of amps:voltage. So limited information can be extracted.

If you go by voltage alone: You still don't know the risk to life as ultimately that is determined by amps. (As you have pointed out, you can have high voltage system that will hurt/impact but won't kill)

If you go by amps alone: You can estimate a biological effect and risk to your heart stopping... But you have to assume sufficient voltage.*

*If its low ampage: risk of death is low despite the number of volts/power.

**if its high amps: you know it may be deadly and should assume the system is capable of delivering the current.