[Doug I]

The purpose built pliers will grip the wire and twist it evenly, without kinking the wire within the twists thereby inducing a point where the wire can break. They will also twist the wire without any slack within the twists. This means that the wired object cannot rotate, take the slack out of the twisted wire and become loose (or backoff a speced torque) - or tighten up if it is wired the other way. And they are fast.

Just because it's wired doesn't mean it's safely wired.

regards

ohh and they woun't over-twist (and maybe over-stress) the wire either

and another 'ohh' - they will evenly spirally twist each wire around the other. Often trad. pliers will only twist 1 wire. The other wire gets twisted along its length - gets overstressed and has 1 or more ductile zones where the wire is very weak. 1 wire twisted around a straight wire will hold nothing, especially when the straight wire is broken or nearly so.