Every one of the manufacturers can reach the 120kw max allowed for the mguk, and probably the minimum mass allowed too, so "robust" is in reference to what? Efficiency?
End of the straights, all the PUs should be harvesting enough from the mguh to sustain the mguk(and possibly feed the battery as well), so why would the Hondas need to turn off the mguk sooner? Mguk not efficient enough? Were they fuel saving more(lift and coast)?
Is there a maximum power for the mguh, and if not what do we think they are producing at maximum boost in race mode?
These questions are for anyone.