This reinvention of the space-time continuum will have your brain doing somersaults if you try and make sense of the endless justifications for all these people doing what they are doing. Arnold is actually pretty good in this film, acknowledging his age & referring to his cyborg status as outdated in a self-deprecating way. John, Reese, & Sarah are all rebooted with digital domain visuals that exploit the latest variation of pixel placement. It's entertaining, but still begs the question as to why any of these cyborgs hasn't destroyed the human race completely given their ability to time travel. Again, don't overthink the plot.