It would only catch on if it could survive the initial phase where it was still a minority. If anyone using it was prepared to quit and try for another job then businesses not using it would out-compete businesses using it. It might not have to be enjoyable, but if it wasn't at least tolerable it wouldn't even get off the ground.
a) In that case, in the story it did get off the ground so it must have been tolerable.
b) Criticizing the frequency of instructions is a pretty weak argument against the story plot since it's not critical to the plot. If 1 minute instructions bothers you a lot, imagine the story says they are 2 or 5 minute instructions, or a wristwatch screen with your next instruction on it.
Oldie but goodie. A piece of fiction describing how a computer system can do the job of human managers at fast food restaurants (scarily plausible), how this leads to a dystopia (slowly getting implausible), and how to avoid this scenario and reach utopia (give me a break).