The following statements apply to U.S. Army rebuilds, not Navy or USMC.
(1) Hatcher Holes were not added to rebuilds until after WWII.
(2) No. Scant stocks were normal for rebuilds.
(3) Rebuilds included "battle used" rifles. But most combat troops were armed with M1Garands, carbines, Thompsons, etc.
(4) Some purists who collect pristine original and/or rare rifles may consider WWII rebuilds as junk. But they are greatly outnumbered.
Hope this helps.
J.B.