On the map that Lee used during the Gettysburg Campaign the word "Gettysburg" covers almost the entire battlefield. The only local map only had the peach orchard marked on it. Lee had not made a personal reconnoissance of the ground. The undisputed fact is that Lee had no knowledge of what lay beyond the view he had of the unnamed hills he had seen from miles away.
Because the route Lee ordered Longstreet to follow & the terrain upon which the attack was to take place was unknown, there is no mystery as to why Hood objected to his orders. Longstreet could have had a signal team with which to communicate with Lee in real time.
We know that there was a CSA Signal Service team attached to Lee's HQ. On the first day of the battle, Lee communicated directly with corps HQ's. One signal was to encourage extreme caution when using a fresh Union code book that had been captured. Not taking advantage of the available signal assets was a fatal mistake.
By contrast, in Tennessee on the 23rd of June Wilder's brigade of mounted infantry earned its moniker, "The Lightening Brigade." Giving the Spencer Repeating Rifle its baptism of fire, Wilder blitzed Hoover's Gap. Thomas had projected a two day battle with at least 2,000 casualties. Because of the firepower of their repeaters, Wilder's men held off determined attacks until support arrived. Because a Beardslee Repeating Telegraph team connected Thomas' HQ with army HQ in Murfreesboro, in the morning Rosecrans redirected the left flank to the center at Hoover's Gap.
It can be argued that Hood, with his knowledge of the ground, had made the correct tactical decision. Whatever the merits, there was no way to communicate that fresh intel to Lee & no way for Lee to access Hood's report.
Note: As we know, Longstreet had to counter march because of the signal team wagging their flags against the skyline on Little Round Top. What he could not know was that the signalists were not transmitting anything. Their ostentatious display was a ruse de guerre. Why, when demonstrably Longstreet respected the potential of a station of observation, did he not have signalists of his own who could have sent Hood's insight directly to Lee?
I don't know the answer to that.