Missing the point why there is a bit of a furor.
Not forgetting the transfer of constitutional powers back from the EU to the UK, self-determination is also a good thing and one of the main reasons for Brexit.
This thread understandably has a natural bias towards business and trade opinion, you have to remember that most people's priorities when basing their referendum voting decision, was not on business and trade opinion (Project Fear helped in that respect - ie people took a contrarian view to the establishment view),
but on sovereignty and self-determination. To retake our judiciary and law making and constitutional powers that have been superceded by the EU central command, throw in a good dose of open borders and hey presto! Brexit
People get hot under the collar for those reasons more than trade or business, unfortunately the political union of the EU demands that control remains superceded to the EU to remain in a 'common market' so the two are inextricably linked.
Accepting constitutional restrictions in exchange for business does not cut it with the average Brexiteer, because of the imposed EU baseline, hence the heated debates.