Early US Intel assessment suggests strikes on Iran did not destroy nuclear sites

It probably damaged them to some extent. Sensitive machines don't like dust and vibration. Bombs are known to cause a lot of both.

From a negotiation standpoint, you're in a weaker position if the enemy's killing machines can cross into your territory virtually unopposed and strike what should be three of the most secure locations in Iranian territory. Both the Israelis and US managed to seriously compromise Iranian territory recently, and while the Iranians could probably draw blood and destruction on American territory if they wanted to, they couldn't do it to the same extent.