........... the average FO probably has <2000 hours flight time (turnover and command at 3000 hours being the norm).
I can perfectly understand why such an airline specified all its aeroplanes with only 1 tiller!
Oh please, not this again. Why does the assumption keep being made that an F/O is somehow not competant to taxi an aircraft? If a pilot has passed all the tests to get into the right seat of a jet in the first place, why would they not be capable of taxiing the thing? Would you let those same pilots drive themselves to work - on the motorway just metres away from other cars at 70 mph? Of course you would. Would you let those pilots park their own cars in the carpark? Of course you would. Would you let those pilots have control of the aircraft to take off, land, go around? etc., etc. Of course you would. So why not taxi????
But a big jet is not the same as a Cessna 152 you say. Correct, but by law pilots must be fully trained to fly an aircraft before being signed off and permitted to operate it, so as long as they are properly trained and pass a suitable competency test, they will be perfectly capable of taxiing anything - as long as they have a tiller, obviously.