It actually isn’t difficult. The problem is that the referendum was split nearly evenly 50 50. And the public is also divided.
The may deal was ok for all except for the backstop which was a means to keep the Irish border open as per the 1997 good Friday agreement. But it was vetoed by the DUP.
To leave a confederation does mean a transition, but the UK did this only half heartedly as its opinion was divided.
This entire fiasco since 2016 is of the UK s making
1. It didn’t lay out the options for type of leave as question 2
2. It didn’t set a threshold for the referendum
3. It didn’t plan before invoking article 50
4. It had an unnecessary general election in 2017 that made the Tories beholden to the DUP
5. It didn’t agree among itself before going to negotiate so the parliament was in the dark. Kinda like now, so they are repeating their mistakes.
6. They didn’t just leave on March 31.
This entire mess is the UK s fault