Despite his weird attraction to a misplaced glorification of the past, Prince Charles' heart is in the right place. His belief in such ideas as locally sustainable supply chains, and valuing sustainable urbanism is not misplaced though.
Portmeirion (Northamptonshire born architect) and Poundbury (Prince Charles' baby) 'work' for reasons subtly different than the classical styling they are dressed in. That difference is the level of visual detail at a human level. A feast for the eye, the beauty in the detail etc. There are many ways of including that depth of detail in more contemporary styles of architecture with materials and texture rather than applied decoration.