To do that, at some point in the installation's early life you would have to replace every 2nd lamp when it still have 1/2 of its useful life ahead. Looks wasteful to me (unless the lamps are reused elsewhere)
Such thinking came from incandescents, where the 1000hoour life to 50% failure rate means using the same scheme keep the light output above the required 70% and where the system encounters so many cycles than wasting half life of the first half of the lamps is not big deal.
It is how the lamps are rated, the recommended (by most makers) group relamping period for 25khour rated lamps is 4 years, what corresponds to the 70% lumen limit (about 15khours plus some few percents of expected hard dead failures).