Imo mixing ranges or even weapon types on a squad just leaves you with a squad that can't do anything properly
I have to hard disagree with that statement, PF and Paratroopers literally disprove your point.
The best close range units aren't great because all the weapons are CQC focused, they are great due to a good combination of smoke/cloak/durability/ability. For this argument lets stick to Allied units since this issue is seen more on the allied side. Shocks are great due to smoke and extreme durability(armor+6man), Airborne PPSH for cloak and smoke while also having ok durability due to 6 man. I think most would agree Assault Guards aren't as good since they only have durability and have no way to actually close in.
But looking at it from a DPS point of view they are every bit as strong if not stronger than the Airborne PPSH despite only having 3 Thompsons. IF we put them in their optimal DPS range (0-10) for both I am pretty sure Assaults Guards would win most of the time due to the weapon switching feature/bug. Since the DPS is concentrated in the 3 models, as the models drop their performance barely falls off until the 4th model drop whereas the Airborne PPSH would lose around 17% with each model.
This is similar to Paratroopers in that they don't lose much DPS until the 3rd model however Paras are still significantly better due to Tactical Assault allowing for instant wipes which reinforces the combination I was talking about earlier.
What I am proposing is literally a USF Fussi. Thompsons can't be dropped just like G43, both have flares, sprint, snare while the rifleman would also be able to build sandbags and throw down mines. Also the in game 2-thompson upgrade only takes 1 weapon slot so you can even put a BAR on them to make you happy. At that point they would be Fussi on steroids. That is why I was unsure of proposing a 3 Thompson upgrade for both slots which would still be mix and matching but would create the best mainline CQC in the game.
For those worrying about balance it would only be in one commander(Rifle Company) and fairly expensive muni wise. So upgrading all of them would be quite an investment and they would still have a weakness at long range. However at close-mid they would dominate and force enemy to try something different.