Personally I find the lack of submachine guns early progression on the allies side on Normandy annoying as I don’t partially like the grease guns that much and you don’t get another submachine unlock until level 22 which is the sten. For something that’s at level 22 honestly the sten is not that great compared to other smg’s.
I would love to see a Thompson a lot earlier in the progression tree because currently its insanely far off or perhaps even another submachine gun could be added to the early levels i have listed a few possible ones below that come to mind.
United Defense M42 - [25 rounds] - [700 RPM]
Reising M55 - [20 rounds] - [500 RPM] - (yes the reising is currently on a premium squad however that is the M50 not the m55)
Also in comparison to the axis side on Normandy they have a pretty good selection of submachine guns on the early levels.