Obviously half of the sky (Boeing) does take off on center tank fuel.
Not true!
The QOTS takes off using tank to engine. Once flaps 5 (iirc) achieved pre-departure, the crossfeed valves to the fuel gallery from the centre tank are automatically closed, the providing tank to engine for take off until a suitable period of time afterwards.
Once they are opened again,m the fuel feeds from the centre tank (and the stab tank feeds the ctr tank) until empty, at whihc point the inners feed all engines untl mains 1-4 are equal at which point it is tank to engine again (when at about 52 tonnes remaining).