Waste of time negotiating with Islamist extremists.
They practice Taqiyyah to begin with.
It was absolutely not a waste of time. It took the talking point of the US not being open to a peaceful ending off the table for good. There will now be no more chains on President Trump. The outcome now will be Iran does unconditionally surrender.
If they are so defiant now, can anyone imagine how they would be if they had been allowed to carry on with building up their nuclear arsenal. There would be zero chance of negotiations.