We cannot ever really know truth and without truth there can be no objective progress. This means in effect the death of ideologies . No over arching theory about the world can point to any future utopia. It is a world of rich, complex diversity - science makes great achievements whilst millions starve. We are bombarded with information from all sides.
Cultures mix and clash.
In architecture and art, in literature and philosophy people mix and match the past with the new and celebrate diversity because this is the best we are going to get.