The real problem with technology is never the actual hardware or software, but the people designing and using it.
Not only have the Kelvans assumed unfamiliar forms, but they are far removed from their own species and all the cultural influence associated with it.
The episode is primarily a study of two classic TOS themes: balance of power and risk.
The androids' ultimate undoing is their inability to comprehend the nuances of human desire and the unpredictability of human happiness.
Our actions will come back to us, sometimes sooner than we expect (or much later, where humpback whales are concerned).
Evil never gets tired. The burden is on the rest of us to guard against these forces and confront them whenever they rise up.
Would a craftsman or artist or deep thinker from past centuries see anything useful in Facebook, human-less tech support, or the latest craptastic Netflix series?
Now we have more music and books and movies to choose from, but we have more tools to give us certainty as consumers.
When does creative expression cross the line from an intriguing pushing of boundaries into crime?