Overdischarging is a mistake. Recharging an overdischarged cell can also be a mistake.
LiIon Safety 101 Lithium-ion battery safety 101 - #10 by The_Miller says:
Don’t over discharge your batteries.
◦ Batteries begin to suffer damage if discharged to 2.5 volts.
◦ Batteries should be discarded if they discharge to 2.0 volts.
In any case, we all want to be safe. Im in favor of system designs that promote safety, for example build overdischarge protection into a light.
I agree education is important. I encourage everyone to share the info in LiIon Safety 101
I also agree there are other flashlight design features that can improve safety.
Ultimately, the choice to use LiIon carries higher risk than other power options. It is not a trivial matter, and most people are unaware of the risks.
I predict a new warning label
The State of California has determined that LiIon batteries contain elements known to cause Cancer.
and people will buy them anyway, until the next more modern, hopefully safer, power source becomes available