This is completely, totally, and nonsensically evil that I'm not sure even where to begin. Supposing your company hired me and I knew this was the opinion of anyone who worked in management I would be polishing my résumé my first day on the job. This is the best way to make sure that the only people working for you are mindless drones and your HR office is a revolving door rather than a ladder for people with an ounce of ambition.
I'm certain that there are employees that like rote work, but for me, I can't stand it and project that onto others.
> it also has the side effect of diminishing job prospects
is a good or desirable thing.
As someone dealing with basically this situation, it sucks, but if I was also getting handed one-off "solve this puzzle and we're going to use the code you make every day" problems and raises early and often, it wouldn't suck nearly this much.
I supposes I could sugar coat things - but given that I'm hiring really smart people they'll figure it out and won't trust me one bit.
I would rather not having that kind of job prospects.