It’s no contradiction. Perfect means-end calculations merely ensures that you’ll choose the best of the options available given that you’ve made a means-end calculation. But you might have different (and better) options if you never made any such calculation. (For a crude illustration, imagine that God exists and will reward people who never make any attempt at instrumental reasoning.) By the time your calculations tell you that you never should have calculated in the first place, it’s too late.
It’s no contradiction. Perfect means-end calculations merely ensures that you’ll choose the best of the options available given that you’ve made a means-end calculation. But you might have different (and better) options if you never made any such calculation. (For a crude illustration, imagine that God exists and will reward people who never make any attempt at instrumental reasoning.) By the time your calculations tell you that you never should have calculated in the first place, it’s too late.