Ah ok, you dont understand.
Say we leave, no deal....
We wont be in customs union -fact or prediction?
No customs union means border checks, - fact or prediction?
UK does £290b exports with EU. Will border checks -cause delays and extra expense for business -fact or prediction?
UK will have to trade under WTO -which gives much worse arrangements than currently -damaging to trade -fact or prediction?
All the above are facts.
You can argue with yourself whether that will be very damaging or hugely damaging to the UK
You are welcome to tell, me I am wrong -just kindly point out why