TBF, Brexit was a particularly bad idea because of the Northern Ireland situation, so others can still feed the illusion that their *exit would be "cleaner"...
Businesses (especially smaller ones) have suffered immensely as a result of supply chain issues, lopsided bureaucracy and red-tape.
Why is Brexit perceived so badly in the EU? Economically the UK has done about as well or better than the other big European economies.
https://ourworldindata.org/grapher/gdp-per-capita-worldbank?...
Only Italy has done substantially better, but that is recovery from the aftermath of the 2008 collapse.
https://www.euronews.com/business/2024/01/12/brexit-here-is-...
https://www.reuters.com/world/uk/london-mayor-says-brexit-ha...
https://news.sky.com/story/brexit-new-report-suggests-uk-311...
One potential confound is that the UK was starting with a strong position so if you just compare it to, say, Portugal it’s still looking better but that doesn’t tell you the gap wouldn’t have otherwise been even wider.
https://ourworldindata.org/grapher/gdp-per-capita-worldbank?...
Some trade barriers have also been lowered since Brexit, reducing costs - e.g. EU protectionist tariffs and quotas on things such as oranges and rice which reduces the cost of living.
The effects of Brexit are tiny compared to the lingering effects of Covid, and the increase in global prices caused by the invasion of Ukraine.
The trick is to be First. You can sell "Just do X and it'll be great" unless the people have already seen what a disaster X is.