You're taking one measure. There have been and still are economic challenges, trade disruptions, and political divisions, particularly in regard to the UK as a whole (Scotland/Wales/NI) and the regulatory divergence from the EU has also led to complications, particularly in industries that rely on seamless EU-UK integration.
A whole generation now has less freedom of movement which, in my opinion, is a crime against youth. However, it does seem that the government are making some, slow, progress in restoring some freedom of movement for the under-30s.