So what do we do? Bring in single engine taxi out. Brilliant ! That won't cause any extra distractions will it ?!?!?!
Oh come on.
We do flight control checks et all while taxiing on 2 engines.
Is it REALLY that more distracting for PM to go "Pump off, Bleed on. Ign. Starting eng 2".
No. If you allow yourself enough time (airmanship!) then there is no rush. There is no real extra distraction.
I am sure the next reason we will hear here is "but there might be a fuel leak!". Which usually comes from the guy who disconnects the ground crew before Eng 2 has even starting turning anyway.