I can only speak for myself but I personally find jobs like that to be very stressful. Every review period a coin flip. Periodic severe swings in work output expectations because the thing you thought wasn’t important is now on some executives quarterly goals. Etc. Spending 40 hours a week doing effectively nothing but pushing a rock up a hill can be exhausting. This is a phenomenon that exists outside of my single anecdote: http://www.garlikov.com/philosophy/Sisyphus.html.

Having clear and achievable targets (that are achieved!) and consistent expectations is much preferable.