I’m a not a native speaker so take it with a grain of salt, but I think it’s the cadence of phrases.

Writers can use it as a tool by playing with the length and complexity of phrases - to create speed or calm, for example.

When the rythm doesn’t change, and there’s a succession of similar-length simple statements for a long time, it sounds robotic after a while:

“I run this command. Then that problem happened. This caused something else . I addressed the issue. Something else happened. Now I adress it.”

This is not a criticism toward the author to be clear, I was just curious about what caused your feeling and checked.