These artists seemed to be fascinated by the apparent randomness (unpredictability) of these machines and let them “do their thing”.
On the opposite side of the spectrum there is Sol LeWitt who didn’t use computers but conceived many of his works as a series of instructions. As if they were meant to be created by machines (art gallery interns).
Many of these artists are still around but in the ‘90s computer art morphed into new media art and interactivity and social engagement became the main focus for artists working with technology.
With the democratization of robotics, drawing machines started to get out of the gallery (see graffiti writer) and became more autonomous.