[ricardobeat]

It even says "Conservative discharge that would not extract maximum performance". A lot of electronics built for li-ion will not work <3V so it's a perfectly reasonable benchmark, especially to show the difference between brands.

[londons_explore]

A lot of electronics need a 3.3v rail and produce that from a linear or buck regulator, so won't work below 3.4 volts.

[Tade0]

Battery operated devices, while nominally 3.3V, commonly work down to 3V or even 2.7V in line with the voltage curve of lithium (not li-ion) coin batteries.