Thanks for the explanations.
I've never been in uniform or in a war; I only ... "know" what I read or what I've picked up from others.
I've gotten the impression from what I've picked up that most people (who've never been in a war, that is) have a highly over-rated opinion of full-auto, or, just really don't understand it.
I have been given to understand that its best use is with crew-served weapons and used for "area-denial" and it helps convince enemy soldiers to keep their heads down and not move around a lot.
I've never been able to examine a "grease-gun" but I have handled (but never been able to fire) real Thompsons. It seems to me that it might be pretty easy to check if the mag is empty, with the bolt back you can look right through the ejection port and see.
This might get "iffy" in a battle I guess. Then of course with stick magazines the bolt was held back by the tab on the magazine follower and thus there's no real "clue" that you're on empty while the AR only holds back the bolt when it
IS on empty.
I took my screen-name here, obviously from the venerable ol' Thompson combining it with the more vernacular "Tommy Gun" with the extra "n" to distinguish it from others who might have appropriated the name + there was an 1960s TV private-eye series called "Peter Gunn." Picked up the idea because I was a big fan (still am) of the old 1960s series "COMBAT!" in which actor Vic Morrow played the squad sergeant, Chip Saunders, who in all but two episodes carried a model 1928 Thompson.
....But I have to admit as to practical, well-designed WW2 guns I prefer the M-1 Carbine over the Thompson, and the Garand for best true "battlerifle" of the WW2 allies.
But, the "Tommy Gun" is still an iconic weapon.