This topic has probably been debated many times. For now, I’d like to summarize my thoughts.
A balanced BR I
As you point out, the Type100 SMG(early) is OP.
It is necessary to increase the BR or return it to its pre-enhancement state.
I’m quite happy with it being buffed to historical stats. I believe all other weapons should get the same treatment.
However, they realistically should’ve uptiered the gun to BR II or III at the same time.
I am starting to suspect that the devs are not allowed to touch BR outside of the major updates anymore given how well recieved those were as part of the “jet power” update according to the CM post.
So maybe the higher ups are banking on so long overdue BR changes to save an otherewise failing update nobody would care about otherwise.
But that might be a bit much tin foil territory.
I’m starting to suspect that the people making decisions for Enlisted are not the sharpest knives in the cabinet. 
Type 97 81 mm infantry mortar High Tier mortar
“Type 97 81 mm infantry mortar was the primary Japanese infantry mortar during World War II”
Chi Ha in TT
I-Go Ko
As a second option to Chi-Ha
Shisei 15cm Tarenso in BR2
20 rockets weighed 30.4 kilograms
Rocket weight: 30.4 kg
Explosive mass: 5.2 kg
Explosive type: ??? (probably cast TNT)
Muzzle velocity: 190 m/s
Range: 4.2 km
Firing angles: 360°
Type 97 with Ji Te Dan to remove and replace the Ofenrohr
2x 20 mm Type 99 Model 2 cannon
250 rounds
13.2 mm Type 3 machine gun
230 rounds
7.7 mm Type 97 machine gun
700 rounds
2x 60 kg Navy Type 97 Number 6 ground bomb
Ki-44 II Otsu in BR1
2 x 40 mm Ho-301 cannons
20 rounds
2 x 12.7mm Ho-103 machine guns
500 rounds
2x Army Type 94 100 kg GPHE bombs
I came to that conclusion a long time ago already.
do not forget smoke thrower for some tanks and also flamethrower tanks
I forgot about the flamethrower tanks but here are two options
Ka-Ho
Sōkō Sagyō Ki
Hmm.
Inside the square frame it says, “第四十五、彈倉内ノ五發ノ實包ヲ射?(undecipherable
)シタルトキハ遊底ハ彈倉ノ彈受ニ止メラレテ停止スルヲ以テ全彈射終リヲ知ルコトヲ得.”
I tried translating it, but it seems to be “On the 45th shot, when the five rounds in the magazine are fired, the bolt is stopped by the magazine’s bullet catcher, indicating that the gun is out of ammo.” It may be a bit strange because it’s a double translation.
True, it is definitely not BR1 anymoe as it’s more in line with the PPS43 at BR2. I know some will say it still needs to go higher but I can still beat BR3 Japanese and Soviets with BR2 Allies and Axis…but new BR1 players don’t stand a chance.
