How bad would a hard Brexit really be?

This account has some gloomy rhetoric, but doesn’t drum up such an awful scenario, for instance:

Among the little-noticed impacts: U.K. citizens and businesses will no longer be able to register internet sites using the .eu domain, and any U.K. entities that currently have such sites will not be able to renew them.

As mentioned, no doubt British truckers would be badly hurt, but what else?  This sounds correct to me:

Custom delays could create food shortages. The U.K. is vulnerable because an extreme heat wave and summer drought caused by global warming have already reduced food output.

Tariffs would be reimposed. They are as high as 74 percent for tobacco, 22 percent for orange juice, and 10 percent for automobiles. That would hurt exporters. Some of that pain would be offset by a weaker pound.

Tariffs would increase prices of imports into the U.K. One-third of its food comes from the EU. Higher import prices would create inflation and lower the standard of living for U.K. residents.

Is this the biggest danger?:

Health Secretary Matt Hancock has warned medical drug companies to expect six months of “significantly reduced access” to the main trade routes between Britain and Continental Europe if there is a no-deal Brexit.

This one seems exaggerated:

“Bodies may remain uncollected and children might miss exams due to gridlocked roads in the event of a no-deal Brexit”, the report said.

So people, what’s the deal?  Put aside the longer and medium-term effects on gdp and the like, what are the greatest short-run dangers of a hard Brexit in the weeks to come?  Or is it a big, overstated worry, the new Y2K?

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