If anything, a weekend at 10K' just before your summit attempt will be good for your confidence and it will add a little experience to your quiver. Go for it.

As for the physiological benefit......almost nil. In my bicycle racing days I was a guinea pig for some high altitude performance research. It takes a long time for your blood to adapt to altitude and a short time to lose the benefit once you go back down.
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If you only travel on sunny days you will never reach your destination.*

* May not apply at certain latitudes in Canada and elsewhere.