Was the UN going to force the U.S. out of Afghanistan if Biden re-wrote the agreement to his liking? The repercussions would have been a few countries making strong statements, if that.
Also a fracture in the world order with other agreements in doubt, US not considered an honest broker, ect.
There are centuries of evidence that the U.S. is not an honest broker (look at our treaty history with Native Americans). This would have made no difference.
While it is true that you can search back in our internal history to find examples of bad deals, it is also true on the international stage the US has a long history of peace, trade, treaty, ect. Deals that have stood the test of time. Of course there are exceptions, like Trump pulling out of the Iran agreement. Which resulted in putting us and the world in an uncertain place. But, by and large, a security agreement for instance, with the US is something other countries want.