There is a huge difference between, say, going to the dentist now versus a hundred years ago, when it was just a drunk guy sticking leeches onto your chest and punching you until the defective tooth flew out.
Yet, if you commit a crime, you'll find that much of that process hasn't changed in decades, if not centuries. I
Is it because these techniques that you've seen in a million crime dramas are perfect and impossible to be improved upon?
No. It's just that some habits are really hard to freaking change.