Each one of them act like human beings and have character.
Max shows up with his muscles glistening, says a one liner, kills the bad guy, and probably fucks all five of them at once thanks to the radiation giving him a five pronged dong. They’re there to be scantily clad rape bait (Chekov’s Cum, if you will) and rescued by the hero.
In any other movie these five women are the MacGuffin.