It's good to agreeRarely do we agree, but on this I'm with you 100%.
Although we've had the legal exchange of contracts, completion date hasn't happened, the buyers are understandably nervous and fearful the 'sale' will fall through. Therein lies the problem.
Because of Brexit, too many are ignoring their mistrust of this incompetent government and continuing to support it, whereas in 'normal' times the public as a whole would be demanding so much more of them.
To continue your analogy, I'd venture that between exchange and completion there was a massive hurricane. The forecasters predicted it a week ahead but the seller didn't board up in time and forgot to tether the caravan in the front garden such that it was blown into the house causing significant damage and killing the mother-in-law. The buyer and seller are still arguing whether it is better to demolish the house and start again, or whether to rebuild and how much each option would cost.
Neither have any expertise in this area and are being given conflicting advice from 'expert' surveyors and architects as to what to do.