While not specifically computers, lets say tech (though I worked on the software for a card access company, so its computers for some of this).
For instance Keycard systems access. Steal a card. Get in anywhere. NOPE. Any real secure place with card access has Card AND PIN. You need both. And if really secure, like a prison, or a mental asylum, it would need third party verification. You’d put your card in, enter the pin, and then someone on the end of a camera will compare your photo from the system to the person in front of them. Then press a wired in switch to open the door. None of it automated. None of it done over wireless (can be blocked, real secure systems are wired into the walls).
None of this happens. Only recent example of something actual real world happened in the movie Relay is where someone uses a duress pin. This is where you’ve been compromised, in that case, someone has a gun on you, and you enter your pin in a different order, to indicate that. There may be different levels, ie: open this door, but trigger security, and don’t open this door, or have a feedback from the keypad indicator that there are heavies with guns behind the next door, and you should duck.
And severed cold hands don’t work on fingerprints, and I think iris scan never happened (not seen it, but perhaps, it always was a bit scifi scan and prone to error).
Also alarms and cctv, if they have an alarm, cutting some wire will shortcut it. Nope. Tamper alarm. I don’t think Dexter has ever entered a house with CCTV for instance. While the novels are a product of its time, there was plenty of CCTV when the show aired. CCTV has motion triggers too, so you know people are in the house.
But all of these don’t suit the narrative shortcut required nowadays. Our hero can shortcut everything, enter secure facilities with a keycard or a dead hand. Hack computers with a second try (nope).
Yep, modern Movies and TV do now have tech as magic. AI, for instance, is currently ludicrously overrepresented, like the tastiness of Taco Bell in Demolition man, great for people writing fiction, not our reality. Something which can make shit movies, and write shit books, isn’t the intelligence they need to make the story work.
But don’t get me onto the use of a keyboard without ever pressing the space key…