Yet Longstreet was very bitter against Stuart’s disappearance at Gettysburg and criticized him strongly in his memoirs. So it wasn’t just Lee. Granted Lee gave Stuart very vague orders but Stuart was happy to interpret them in a way that would let him take another “glory” ride like he did during the peninsula campaign. Only it didn’t work out so well. I certainly am not defending Lee here, the disaster that was the Gettysburg campaign was all on him but there was plenty of blame to go around.
Back to Longstreet’s memoirs. Lee gave Stuart vague orders, but Longstreet said in his memoirs that he gave Stuart very detailed orders, and Stuart didn’t follow them.
Also at the very beginning of Longstreet’s memoirs, he thanks the staff officers who served under him during the war. One was named Payton Manning.