Serious answer:
Because any 'opportunity' from Brexit comes from the government being able to regulate and legislate independently but to date, the government has largely refused to get specific about what this will look like.
Perhaps because inevitably...
... such proposals are either pie in the sky, "We'll get fully liberalizing FTA's with half the world without sacrificing any of our sovereignty and still protecting any industry that looks good on telly!"
or...
... realistic but involving hard and potentially unpopular policy choices.
Environmental Protection vs Business Costs
Worker's Rights vs Employer Flexibility
Government Support vs Free Market
The government doesn't want these fights right now, so speaks in abstractions.
This means that on the BBC, those speaking about 'risks' are able to do so in concrete terms about market access loss, supply chain disruption, regulatory and certification barriers etc.
While the 'opportunity' crowd can only bleat empty slogans.
Hope that helps. /end
Unless you are a Minister from Her Majesty's Government, this is not an invitation for you to come into my mentions to tell me your pet post No-Deal dream policy.
We all have policy dreams, but this isn't Sim City and that's not what this thread is about.