As per the discussion,its clear that neither M1 nor Johnson been recommended for 1st Line offensive,say for a daylight engagement within 200 yrds. Probably not good for regular troops,provided would have been better for self protection or for the sentries,cooks,drivers,signal men etc.and may be used in 2nd Line.
During War 2['42-'43]but these had been produced by good numbers and handed over[obviously better and effective variants been developed to replace those guns].
What a Plat.Comdr would do[he informed that the enemy equipped with rifles and semi-autos only] if he had to engage his men for a moderate offensive in daylight,say for a range of 150-200 yrds around a firm-house, where he had no opt other than the available guns like M1-Carbine,Thompson,M 1941 or M1 Garand?[assuming he had opts]
Do you consider it as an impossible situation that never happened in the Theater ? Which pair he would have taken for his 1st Line?