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From “Shots Fired in Anger” by LTC (then LT) John George, a rifle champion who fought on Quadalcanal and then in Merrill’s Marauders . The Marauders walked 800 miles through jungles and the Himalayas to attack behind Japanese lines, wreaking havoc.

“-The oft-mentioned ability of the Tommy gun to hit and kill at ranges up to five hundred yards is pure theoretical hokum. Practically speaking, the gun will always be an ultra short range weapon, good in the jungle and in street fighting, but poor where the least measure of accuracy is called for. Another most serious limitation is poor penetration. Bullets that bounce off a hard wood surface at 50 yards are not good brush-rakers. Firing a Tommy into the jungle blindly is not effective because so many of the bullets would be stopped by vines and branches. The greater power of military rifle cartridges, fired from full-automatic rifles and machine guns would be preferable for such work. The standard Japanese bullet-proof vest, which would not even slow down a carbine bullet, stopped .45 slugs cold, whether fired from pistols or Tommy guns.

...The advent of the carbine later on in the war eliminated, in my opinion, the last need for a Tommy gun. The carbine made a much more accurate offensive weapon, and a much quicker pointing and more accurate defensive weapon. The lighter weight and greater penetrating power of the .30 caliber carbine catridge increased this superiority even more.”
Pages 395-396.