The bit about ATC watching carefully somehow reminds me of the unfortunate write off of the BA 747 in Capetown. I think the FO may even have been steering at the time when they crashed into the building. It can be argued both ways. Taxying a large aircraft is not always as easy as it looks. If you are a long haul pilot at the controls only for a few sectors a month at airports you visit occasionally, maybe a set procedure where the captain steers and the co-pilot has the chart out (or on screen) and is actively monitoring is not such a bad idea. Ar least the roles are clearer and FOs are generally better at concentrating on the chart.