I fully agree with this sentiment.
[WARNING ABOUT TO GET ON A SOAP-BOX.]
In practice, you cannot ignore the dull, ho-hum tasks and just focus on the exciting and challenging. In my mind, that's the quickest way to get fired, or lose your company if its your own business. As a small business owner, my company would collapse if my partner and I failed to do the dull day-to-day acivities required to keep our doors open. In addition to the day-to-day activities, not all the work we do for our clients is always exciting and challenging, but it still has to get done. I don't necessarilly condone make-work without purpose, but in the larger context, that work was assigned by a teacher and, therefore, requires attention. My business does not have employees, but if it did, I would expect them to complete assigned tasks whether or not they were interesting or challenging. It's a question of personal responsibility for work assigned to you not a question of what you are capable of doing. So you can put this into perspective, I make these statements as an overly educated someone with two MS degrees, a PhD and a JD, and having passed through the "gifted and talented" programs in public school many a year ago.
Further, I don't believe that this is a political issue that neatly falls in line with liberal or conservative trends. I don't consider myself either as my views differ dramatically on an issue-by-issue basis. How you pose the issue is also relevant.
1) The teachers at the school are assigning make work to the students in order to create a PC environment to homoginize the educational process. Grading should not depend upon such rote make work assigned simply to allow students having difficulties with the more challenging assigned work.
2) The teachers at the school are assigning make work so the students are adequately prepared when they enter the work force to discharge all tasks assigned to them no matter how menial. Receiving an A requires that the student perform exceptionally in all tasks assigned.
I would suggest that either statement could be attributed to the situation you described. I also would suggest that either could be ascribed to a "conservative" mind set.
Mandatory Fine Print Disclaimer

I am an attorney after all...
Please remember that these are simply my opinions. I will not begrudge the OP or anyone else from having a different perspective on this.
[STEPPING OFF THE SOAP-BOX]
Of course, if I had stayed a computer scientist rather than a college professor and an attorney for a number of years, I probably would have left it at my original sentence and saved everyone from my soap-box...