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I would say that TIGER is less and less a factor in whether new mappers start. The road network is ‘largely correct’, with major emphasis on Interstate, US Highways and state roads. I would freely navigate long distance on OSM data, but regional roads might still be problematic. [Except that the license change has temporarily destroyed the long distance routing network ]

Note that this is the same state as if those roads had been created by individual mappers who have moved on: an outsider will glance at the map and say “it is done, I have nothing to do here” and move on.