I don’t personally see this a good reason at all.
The US had a good run building neoclassical government buildings in the spitting image of the Romans and Greeks, and we already know that when properly done the aesthetic will stand the test of time for thousands of years.
As far as the improved materials argument that’s up for debate too. Will Boston City Hall be standing in 2,000 years? If I could put money on it I’d say it’s more likely to end up in a landfill.