You beat me to it ...
people keep on asking me if I think that Brexit will be a good idea. I always say ''I don't know as I don't know what the UK relationship with the EU will be after Brexit.''
Remember: all the brouhaha is about the *exit deal*, getting on to three years post referendum and they have hardly talked about what the post Brexit relationship will be. So how can anybody pass opinion on something that, for now, is a vague wish list ?
Refusing to talk about the new relationship until after exit strikes me as stupidity in the extreme; or perhaps political game playing.