Well, of course Brexit has created 'EU issues', but the point is that the UK's confusion and incompetence and the EU's intransigence and bad faith made them all much worse.
The border in Ireland was a fudge that worked better when the UK and Ireland were both in the EU, but - due to Brexit - the EU demanded unnecessary clarity, which made it more of an issue now.
Fishing wasn't an issue because the UK gave up fishing rights to join the EU and - due to Brexit - The UK wanted those rights back, but the EU thought it was ok to want to keep them.
Massive form filling became an issue because the EU bureaucracy (and trade cartel) already meant that there were 24 separate steps for, say, New Zealand to export a lamb chop to, say, France, and the EU decided to try to impose the same level of protectionist bureaucracy on the UK when it left. So you can view that as the UK being crazy going from 4 steps to 24, or the EU being an evil protectionist cartel for having 24 steps for outsiders in the first place, and also for unnecessarily and vindictively imposing them on the UK.
What devaluation of the pound? Do you mean the correction of the bubble between mid 2014 and mid 2016?
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For the huge queues of lorries (do these really exist now?), see 'massive form filling' above.
The expected 9% fall in GDP is a speculative forecast by the same economists who predicted this would happen immediately after the vote, which it didn't.
Yes we could 'look closer to home' but basically there could have been a good Brexit, if the UK hadn't been incompetent and the EU hadn't been evil.