What I want to know is, where's the benefit? - any benefits are not obvious.
There could and should be benefits, though - the UK economy is huge, and we have lots of willing trading partners - the EU, Australia, Singapore, South Korea, the US, Canada, etc.
The fact that Brexit is going poorly is down mainly to the incompetence of UK government ministers, but the sheer bloody-mindedness of EU ministers to make Britain pay for daring to leave must also be acknowledged.
Brexit was supposed to be about regaining control, i.e. Britain should be politically independent and should govern itself. Sadly, this hasn't been properly realised because we're still a member of the European Court of Human Rights (ECHR). This means foreign judges can still overrule legal decisions made by British ones. This, I think, is bad. We should leave ECRH.